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Note 8 - Leases - Lease Modifications (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Oct. 01, 2020 | Dec. 31, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2020 | Dec. 31, 2019
Lease Agreement, EMS Facility in Fremont, California [Member] |  |  |  |  |  |  |
Non-cash increases in operating lease liabilites and ROU assets |  |  |  | $ 1,176 |  | $ 1,176 |
Lease Agreement, Ambrell’s U.K [Member] |  |  |  |  |  |  |
Modification to lease for Ambrell’s U.K. facility |  |  |  |  | $ (486) |  | $ (486)
Lease Agreement, EMS Facility in Mt. Laurel, New Jersey [Member] |  |  |  |  |  |  |
Non-cash increases in operating lease liabilites and ROU assets |  |  |  |  |  | 2,051 |
Lease for Facility in Mansfield, Massachusetts [Member] |  |  |  |  |  |  |
Non-cash increases in operating lease liabilites and ROU assets |  |  |  |  |  |  | 1,811
Lease Agreement, Ambrell’s Netherlands Facility [Member] |  |  |  |  |  |  |
Non-cash increases in operating lease liabilites and ROU assets | $ 133 |  |  |  |  | 133 |
Modification to lease for Ambrell’s U.K. facility |  |  | $ (48) |  |  |  | $ (48)
Automobile Leases [Member] |  |  |  |  |  |  |
Non-cash increases in operating lease liabilites and ROU assets |  | $ 91 |  |  |  | $ 91 |

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: | us-gaap_LeaseContractualTermAxis=intt_LeaseAgreementEMSFacilityInFremontCaliforniaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LeaseContractualTermAxis=intt_LeaseAgreementAmbrellsUKMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LeaseContractualTermAxis=intt_LeaseAgreementEmsFacilityInMtLaurelNewJerseyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LeaseContractualTermAxis=intt_LeaseForFacilityInMansfieldMassachusettsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LeaseContractualTermAxis=intt_LeaseAgreementAmbrellsNetherlandsFacilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LeaseContractualTermAxis=intt_AutomobileLeasesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |