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Note 2 - Summary of Significant Accounting Policies (Details Textual) - USD ($) $ in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2019 | May 31, 2018
Inventory Write-down | $ 171 | $ 107 |  |
Contingent Liability, Repayment of State and Local Grant Funds Received | 463 |  | $ 463 |
City of Rochester and State of New York [Member] |  |  |  |
Covenant, Future Amount Receivable | $ 87 |  |  | $ 550

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- Definition Amount of liability recognized arising from contingent for repayment of state and local grant funds received. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Future amount receivable if we create and maintain specified levels of employment in the specified location through various dates ending in 2023. + References No definition available. + Details
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Namespace Prefix: | intt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Amount of loss from reductions in inventory due to subsequent measurement adjustments, including, but not limited to, physical deterioration, obsolescence, or changes in price levels. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=116847112&loc=d3e4542-108314 + Details
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Balance Type: | debit
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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |