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FAIR VALUE MEASUREMENT (Narrative) (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Fair Value Disclosures [Abstract] |  |
Notional amount of open forward contracts | $ 3,345 | $ 13,927
Notional amount of open call options | 10,196 |
Notional amount of open put options | $ 2,056 |

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- Definition Notional amount of open call options. + References No definition available. + Details
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- Definition Notional amount of open put options. + References No definition available. + Details
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- Definition Notional amount of open forward contracts. + References No definition available. + Details
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Namespace Prefix: | tatt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
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