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Schedule II - Valuation and Qualifying Accounts (Tables) | 12 Months Ended
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Dec. 31, 2020
Notes Tables |
Valuation Allowances and Reserves [Table Text Block] |
|  | Balance at Beginning of Period |  |  | Expense (Recovery) |  |  | Deductions |  |  | Foreign Currency Translation Adjustments |  |  | Balance at End of Period |
Year Ended December 31, 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts |  | $ | 211 |  |  | $ | - |  |  | $ | - |  |  | $ | 1 |  |  | $ | 212 |
Warranty reserve |  |  | 334 |  |  |  | 32 |  |  |  | (131 | ) |  |  | - |  |  |  | 235 |
Year Ended December 31, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts |  | $ | 233 |  |  | $ | 3 |  |  | $ | (25 | ) |  |  | - |  |  | $ | 211 |
Warranty reserve |  |  | 346 |  |  |  | 243 |  |  |  | (255 | ) |  |  | - |  |  |  | 334 |

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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_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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