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Note 7 - Leases - Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Apr. 08, 2019 | Mar. 31, 2019 | Sep. 30, 2019 | Dec. 31, 2019
UNITED KINGDOM |  |  |  |
Non-cash decreases in operating lease liabilities and right-of-use assets as a result of lease modifications |  | $ (486) |  | $ (486)
Mansfield, Massachusetts [Member] |  |  |  |
Non-cash increases in operating lease liabilities and right-of-use assets as a result of lease modifications | $ 1,811 |  |  | 1,811
NETHERLANDS |  |  |  |
Non-cash decreases in operating lease liabilities and right-of-use assets as a result of lease modifications |  |  | $ (48) | $ (48)

X
- Definition Represents the non-cash decrease in operating lease liabilities and right-of-use assets. + References No definition available. + Details
Name: | intt_DecreaseInOperatingLeaseLiabilitiesAndRightOfUseAssetsNonCash
Namespace Prefix: | intt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Represents the non-cash increase in operating lease liabilities and right-of-use assets. + References No definition available. + Details
Name: | intt_IncreaseInOperatingLeaseLiabilitiesAndRightofuseAssetsNonCash
Namespace Prefix: | intt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | srt_StatementGeographicalAxis=country_GB
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=intt_MansfieldMassachusettsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=country_NL
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |