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Note 16 - Quarterly Consolidated Financial Data (Unaudited) (Details Textual) - USD ($) $ in Thousands | 3 Months Ended
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Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability Including Earnout Payable | $ 2,828 | $ 3,057 | $ (710) | $ 1,726

X
- Definition Amount of increase (decrease) in the value of a contingent consideration liability including earnout payable. + References No definition available. + Details
Name: | intt_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiabilityIncludingEarnoutPayable
Namespace Prefix: | intt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration