Document And Entity Information Note To Financial Statement Details Textual statementsignificantaccountingpoliciespolicies statementnote2summaryofsignificantaccountingpoliciestables statementnote3acquisitiontables statementnote4fairvaluemeasurementstables statementnote5goodwillandintangibleassetstables statementnote7inventoriestables statementnote8debttables statementnote9stockbasedcompensationtables statementnote12segmentinformationtables statementnote2summaryofsignificantaccountingpoliciesweightedaveragecommonsharesdetails statementnote3acquisitionpurchasepricedetails statementnote3acquisitionintangibleassetsacquireddetails statementnote3acquisitionproformainformationdetails Net revenues Net revenues Revenues statementnote4fairvaluemeasurementsliabilitiesmeasuredonarecurringbasisdetails statementnote5goodwillandintangibleassetschangesintheamountofthecarryingvalueofgoodwilldetails statementnote5goodwillandintangibleassetschangesintheamountofthecarryingvalueofintangibleassetsdetails statementnote5goodwillandintangibleassetsintangibleassetsdetails statementnote5goodwillandintangibleassetsfutureamortizationexpensedetails statementnote7inventoriesinventorieshelddetails statementnote8debtoutstandinglettersofcreditdetails statementnote9stockbasedcompensationallocationofsharebasedcompensationexpensedetails statementnote9stockbasedcompensationnonvestedsharesdetails statementnote9stockbasedcompensationstockoptionsvaluationassumptionsdetails statementnote9stockbasedcompensationstockoptionactivitydetails statementnote9stockbasedcompensationstockoptionactivitydetailsparentheticals statementnote12segmentinformationsegmentinformationdetails statementnote12segmentinformationidentifiableassetsdetails statementnote12segmentinformationnetrevenuefromunaffiliatedcustomersdetails statementnote12segmentinformationlonglivedassetsbygeographicalareadetails Notes To Financial Statements Notes To Financial Statements [Abstract] CASH FLOWS FROM INVESTING ACTIVITIES us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet Other assets us-gaap_IncreaseDecreaseInOtherOperatingLiabilities Accrued professional fees Customer deposits and deferred revenue us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable Domestic and foreign income taxes payable us-gaap_ComprehensiveIncomeNetOfTax Comprehensive earnings us-gaap_IncreaseDecreaseInOtherAccruedLiabilities Accrued rent us-gaap_IncreaseDecreaseInEmployeeRelatedLiabilities Accrued wages and benefits Preferred stock, shares outstanding (in shares) New Accounting Pronouncements, Policy [Policy Text Block] Reclassification, Policy [Policy Text Block] us-gaap_IncreaseDecreaseInAccountsPayable Accounts payable Line of Credit, ExpirationDate Line of Credit, Issue Date Restricted certificates of deposit Cash and cash equivalents Cash and cash equivalents at beginning of period Cash and cash equivalents at end of period Lease Expiration Date us-gaap_IncreaseDecreaseInOtherCurrentLiabilities Other current liabilities Debt Disclosure [Text Block] Amortization of deferred compensation related to stock-based awards Pension and Other Postretirement Benefits Disclosure [Text Block] us-gaap_FairValueInputsDiscountRate Fair Value Inputs, Discount Rate us-gaap_ConcentrationRiskPercentage1 Concentration Risk, Percentage Customer Concentration Risk [Member] us-gaap_TreasuryStockValue Treasury stock, at cost; 33,077 and 33,077 shares, respectively Concentration Risk Type [Domain] us-gaap_IncreaseDecreaseInOtherOperatingAssets Restricted certificates of deposit Goodwill Intangible And Long Lived Assets [Policy Text Block] The policy disclosure of goodwill intangible and long lived assets. us-gaap_StockRepurchasedAndRetiredDuringPeriodShares Stock Repurchased and Retired During Period, Shares Repurchase and retirement of common stock (in shares) us-gaap_StockRepurchasedAndRetiredDuringPeriodValue Stock Repurchased and Retired During Period, Value Repurchase and retirement of common stock Concentration Risk Type [Axis] Relationship to Entity [Domain] Title of Individual [Axis] us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets Prepaid expenses and other current assets Sales Revenue, Net [Member] Fair Value by Liability Class [Domain] Liability Class [Axis] Concentration Risk Benchmark [Domain] us-gaap_AllocatedShareBasedCompensationExpense Allocated Share-based Compensation Expense Concentration Risk Benchmark [Axis] Nature of Operations [Text Block] Customer deposits and deferred revenue intt_CustomerAdvancesAndDepositsAndDeferredRevenueCurrent The current portion of aggregate prepayments received from customers for goods or services to be provided in the future, as well as the current portion of money or property received from customers that are to be returned upon satisfactory contract completion or as partial prepayment for goods or services to be provided in the future. Also includes the carrying amount of consideration received or receivable as of the balance sheet date on potential earnings that were not recognized as revenue in conformity with GAAP, and which are expected to be recognized as such within one year or the normal operating cycle, if longer, including sales, license fees, and royalties, but excluding interest income. Issuance of unvested shares of restricted stock (in shares) us-gaap_IncreaseDecreaseInAccountsReceivable Trade accounts receivable Schedule Of Intangible Assets [Table Text Block] The tabular disclosure of the intangible assets. Granted (in shares) Ambrell [Member] Related to the acquisition of Ambrell. us-gaap_LiabilitiesAndStockholdersEquity Total liabilities and stockholders' equity Retained earnings Accumulated other comprehensive earnings us-gaap_IncreaseDecreaseInInventories Inventories us-gaap_IncreaseDecreaseInReserveForCommissionsExpenseAndTaxes Accrued sales commissions Hakuto Co Ltd [Member] The name or description of the customer. us-gaap_ForeignCurrencyTransactionGainLossBeforeTax Foreign exchange gain EMS [Member] Represents the information pertaining to inTEST Electromechanical Semiconductor Products (EMS). Schedule of Segment Reporting Information, by Segment [Table Text Block] us-gaap_NumberOfReportableSegments Number of Reportable Segments us-gaap_NumberOfOperatingSegments Number of Operating Segments Aggregate Total Payout [Member] Related to the aggregate total payout that may be made under the contingent consideration arrangement. Estimated working capital adjustments The estimated adjustments made to working capital as a result of, and included in the purchase price of, the acquisition of a business by the company. Share-based Compensation Award, Tranche Four [Member] Fourth portion of share-based compensation award differentiated by a particular vesting feature, including, but not limited to, performance measure or service period. intt_BusinessCombinationsFinitelivedIntangibleAssetsAmortizationExpenseEffectOfA10IncreaseOrDecreaseChangeInValuation Business Combinations, Finite-lived Intangible Assets Amortization Expense, Effect of a 10% Increase or Decrease Change in Valuation The effect of a 10% increase or decrease in the valuation of intangible assets acquired by the company in a business combination. intt_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccruedExpenses Accrued expenses Amount of expenses that have been accrued, but not yet paid, assumed at the acquisition date. intt_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesCustomerAdvances Customer advances Amount of liabilities incurred for advances taken from customers by the company, assumed at the acquisition date. Segment Reporting Disclosure [Text Block] Fair Value Measurement, Policy [Policy Text Block] The Ambrell Plan [Member] Related to the Ambrell defined contribution retirement plan. Subsequent Events, Policy [Policy Text Block] Business Acquisition Contingent Consideration Liability [Member] Related to the business acquisition contingent consideration liability. Prepaid expenses and other current assets us-gaap_DisclosureTextBlockAbstract Notes to Financial Statements intt_BusinessCombinationContingentConsiderationArrangementsProjectedEBITDALowerLimit Business Combination Contingent Consideration Arrangements Projected EBITDA Lower Limit The lower limit of projected EBITDA in relation to certain contingent consideration arrangements made by the company. intt_BusinessCombinationContingentConsiderationArrangementsProjectedEBITDAUpperLimit Business Combination Contingent Consideration Arrangements Projected EBITDA Upper Limit The upper limit of EBITDA projected under certain contingent consideration arrangements made by the company. Raw materials Business Combinations Policy [Policy Text Block] Finished goods Earnings Per Share, Policy [Policy Text Block] Fair Value, Measurements, Recurring [Member] Other income Work in process Fair Value, Measurement Frequency [Domain] Measurement Frequency [Axis] Income Tax, Policy [Policy Text Block] Changes in assets and liabilities: us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent Deferred tax assets intt_DefinedContributionPlanMaximumAnnualEmployerMatchingContributionPerEmplyeeAmount Defined Contribution Plan Maximum Annual Employer Matching Contribution Per Emplyee Amount Maximum dollar amount of employer's annual matching contribution to a defined contribution plan Asset [Member] The information pertaining to a financial statement line item. us-gaap_OperatingIncomeLoss Operating income Schedule of Inventory, Current [Table Text Block] Cost of revenues Inventory Disclosure [Text Block] Deferred income tax expense us-gaap_GrossProfit Gross margin Treasury stock, at cost, 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Shares Outstanding (in shares) Domestic and foreign income taxes Addtional paid-in capital Inventories Total inventories Stockholders' equity: Revenue Recognition, Policy [Policy Text Block] Standard Product Warranty, Policy [Policy Text Block] Trading Symbol Letters of Credit Amount Outstanding us-gaap_StockholdersEquity Total stockholders' equity Balance Balance Inventory consigned to others Commitments and Contingencies us-gaap_Liabilities Total liabilities CASH FLOWS FROM OPERATING ACTIVITIES Concentration Risk Disclosure [Text Block] Allowance for doubtful accounts Trade accounts receivable, net of allowance for doubtful accounts of $146 and $146, respectively Statement [Line Items] AOCI Attributable to Parent [Member] UNITED STATES Fair Value Disclosures [Text Block] Current assets: Identifiable assets: Foreign currency translation adjustments us-gaap_NetCashProvidedByUsedInFinancingActivities Net cash used in financing activities 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Goodwill Goodwill Balance Balance us-gaap_PropertyPlantAndEquipmentNet Property and Equipment Net property and equipment Independent Directors [Member] Represents the independent directors. us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment Less: accumulated depreciation us-gaap_PropertyPlantAndEquipmentGross Gross property and equipment Debt Instrument [Axis] Debt Instrument, Name [Domain] Leasehold improvements Machinery and equipment Schedule of Carrying Value of Finite-lived Intangible Assets [Table Text Block] Tabular disclosure of the carrying value of finite-lived intangible assets. us-gaap_TableTextBlock Notes Tables