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Note 2 - Summary of Significant Accounting Policies (Details Textual) $ in Thousands | Sep. 30, 2020 USD ($)
--- | ---
Deferred Grant Proceeds | $ 32
City of Rochester and State of New York [Member] |
Contingent Liability, Repayment of State and Local Grant Funds Received | 463
Covenant, Future Amount Receivable | $ 423

X
- Definition Amount of liability recognized arising from contingent for repayment of state and local grant funds received. + References No definition available. + Details
Name: | intt_ContingentLiabilityRepaymentOfStateAndLocalGrantFundsReceived
Namespace Prefix: | intt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Future amount receivable if we create and maintain specified levels of employment in the specified location through various dates ending in 2023. + References No definition available. + Details
Name: | intt_CovenantFutureAmountReceivable
Namespace Prefix: | intt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Represents the amount of deferred grant proceeds. + References No definition available. + Details
Name: | intt_DeferredGrantProceeds
Namespace Prefix: | intt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | srt_CounterpartyNameAxis=intt_CityOfRochesterAndStateOfNewYorkMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |