OTHER ACCRUED LIABILITIES (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
OTHER ACCRUED LIABILITIES (Details)
Lease liability - short term	$ 623	$ 601
Product warranty	430	432	$ 371
Sales return reserve	71	71
Other taxes	132	180
Other	183	129
Other accrued liabilities	$ 1,439	$ 1,413