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Note 15 - Subsequent Events (Details Textual) - USD ($) $ in Thousands | Jul. 19, 2021 | Dec. 28, 2020
--- | --- | ---
Subsequent Event [Member] |  |
Incremental Sublease Income Above Impairment Charge | $ 350 |
EMS Segment Restructuring and Facility Consolidation [Member] |  |
Operating Lease, Impairment Loss |  | $ 522

X
- Definition Amount of incremental sublease income above the impairment charge that have recorded. + References No definition available. + Details
Name: | intt_IncrementalSubleaseIncomeAboveImpairmentCharge
Namespace Prefix: | intt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of loss from impairment of right-of-use asset from operating lease. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 25 -Paragraph 6 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=123399704&loc=SL77918431-209957 + Details
Name: | us-gaap_OperatingLeaseImpairmentLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RestructuringPlanAxis=intt_EMSSegmentRestructuringAndFacilityConsolidationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |