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EMPLOYEE BENEFIT PLANS - Narrative (Details) $ in Thousands | 9 Months Ended
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Sep. 30, 2025 USD ($)
Postemployment Benefits [Abstract] |
Employee contributions match | 10.00%
Maximum employee contribution limit | $ 5
Employer contributions vesting period | 4 years
Amount recorded in Other Liabilities for TFR | $ 1,600

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- 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

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

X
- Definition Aggregate carrying value as of the balance sheet date of the liabilities for all deferred compensation arrangements payable beyond one year (or the operating cycle, if longer). + References No definition available. + Details
Name: | us-gaap_DeferredCompensationLiabilityClassifiedNoncurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

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- References No definition available. + Details
Name: | us-gaap_PostemploymentBenefitsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration