Note 2 - Summary of Significant Accounting Policies (Details Textual) $ in Thousands	Sep. 30, 2021 USD ($)
Deferred Grant Proceeds	$ 77
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

Future amount receivable if we create and maintain specified levels of employment in the specified location through various dates ending in 2023.

No definition available.

Name:	intt_CovenantFutureAmountReceivable
Namespace Prefix:	intt_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant