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Schedule II - Valuation and Qualifying Accounts (Tables) | 12 Months Ended
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Dec. 31, 2024
Notes Tables |
Valuation Allowances and Reserves [Table Text Block] |
(in thousands) |  | Balance at Beginning of Period |  |  | Expense (Recovery) (1) |  |  | Additions (Deductions) |  |  | Reserve Amounts Acquired through Business Combinations |  |  | Foreign Currency Translation Adjustments |  |  | Balance at End of Period |
Year Ended December 31, 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for credit losses |  | $ | 474 |  |  | $ | 27 |  |  | $ | (48 | ) |  | $ | - |  |  | $ | (30 | ) |  | $ | 423 |
Warranty reserve |  |  | 648 |  |  |  | 669 |  |  |  | (677 | ) |  |  | 162 |  |  |  | - |  |  |  | 802 |
Year Ended December 31, 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for credit losses |  | $ | 496 |  |  | $ | - |  |  | $ | (19 | ) |  | $ | - |  |  | $ | (3 | ) |  | $ | 474 |
Warranty reserve |  |  | 673 |  |  |  | 351 |  |  |  | (376 | ) |  |  | - |  |  |  | - |  |  |  | 648 |

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- Definition Tabular disclosure of a schedule of allowance and reserve accounts where the valuation and qualifying accounts are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs. + References No definition available. + Details
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Namespace Prefix: | intt_
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Balance Type: | na
Period Type: | duration

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