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Note 13 - Employee Benefit Plans (Details Textual) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
401(k) Plan [Member] |  |  |  |
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay |  |  | 10.00% |
Defined Contribution Plan Maximum Annual Employer Matching Contribution Per Emplyee Amount |  |  | $ 5 |
Defined Contribution Plan Employer Matching Contribution Vesting Period (Year) |  |  | 4 years |
Defined Contribution Plan, Employer Discretionary Contribution Amount | $ 51 | $ 56 | $ 322 | $ 313
The Ambrell Plan [Member] |  |  |  |
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay |  |  | 10.00% |
Defined Contribution Plan, Employer Discretionary Contribution Amount | $ 44 | $ 17 | $ 131 | $ 49
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent |  |  | 100.00% |
Defined Contribution Plan, Employer Matching Contribution, Percent of Match |  |  | 50.00% |
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Amount |  |  | $ 5 |

X
- Definition Defined contribution plan employer matching contribution vesting period. + References No definition available. + Details
Name: | intt_DefinedContributionPlanEmployerMatchingContributionVestingPeriod
Namespace Prefix: | intt_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Maximum dollar amount of employer's annual matching contribution to a defined contribution plan + References No definition available. + Details
Name: | intt_DefinedContributionPlanMaximumAnnualEmployerMatchingContributionPerEmplyeeAmount
Namespace Prefix: | intt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of discretionary contributions made by an employer to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage employer matches of the employee's percentage contribution matched. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerMatchingContributionPercentOfMatch
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Maximum amount the employee may contribute to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeeAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_RetirementPlanNameAxis=intt_The401KPlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RetirementPlanNameAxis=intt_TheAmbrellPlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |