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Note 2 - Summary of Significant Accounting Policies (Details Textual) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Inventory Write-down | $ 39 | $ 171
Deferred Grant Proceeds | 81 |
City of Rochester and State of New York [Member] |  |
Contingent Liability, Repayment of State and Local Grant Funds Received | 463 |
Covenant, Future Amount Receivable | $ 370 |

X
- 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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Namespace Prefix: | intt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- 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_
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Balance Type: | debit
Period Type: | instant

X
- Definition Represents the amount of deferred grant proceeds. + References No definition available. + Details
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Balance Type: | credit
Period Type: | instant

X
- 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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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |