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Note 5 - Goodwill and Intangible Assets (Details Textual) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Goodwill and Intangible Asset Impairment, Total | $ 0 | $ 0
Minimum [Member] |  |
Discounted Cash Flows, Discount Rate | 19.50% | 14.50%
Maximum [Member] |  |
Discounted Cash Flows, Discount Rate | 20.50% | 16.00%

X
- Definition Discount rate used by discounted cash flows. + References No definition available. + Details
Name: | intt_DiscountedCashFlowsDiscountRate
Namespace Prefix: | intt_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Total loss recognized during the period from the impairment of goodwill plus the loss recognized in the period resulting from the impairment of the carrying amount of intangible assets, other than goodwill. + References No definition available. + Details
Name: | us-gaap_GoodwillAndIntangibleAssetImpairment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |