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Note 17 - Subsequent Events (Details Textual) - CALIFORNIA - Subsequent Event [Member] $ in Thousands | Jan. 23, 2020 USD ($)
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Lessee, Operating Lease, Renewal Term | 5 years 30 days
Increase in Operating Lease Liabilities and Right-of-Use Assets, Non-cash | $ 1,176

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

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- Definition Term of lessee's operating lease renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918673-209980 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | instant

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- Details
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |