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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

X

- Definition

Notional amount of open call options.

+ References

No definition available.

+ Details

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X

- Definition

Notional amount of open put options.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
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X

- 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

X

- References

No definition available.

+ Details

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