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Note 9 - Debt (Details Textual) - Letter of Credit [Member] - USD ($) $ in Thousands | Dec. 31, 2019 | Apr. 01, 2019 | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | --- | --- | ---
Letters of Credit Outstanding, Amount | $ 140 |  |  | $ 175
Mt Laurel [Member] |  |  |  |
Letters of Credit Outstanding, Amount | $ 90 | $ 90 | $ 125 | $ 125

X
- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
Name: | us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_CreditFacilityAxis=us-gaap_LetterOfCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=intt_MtLaurelMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |