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SEVERANCE PAY FUND AND ACCRUED SEVERANCE PAY (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
SEVERANCE PAY FUND AND ACCRUED SEVERANCE PAY      
Severance pay fund $ 1,837 $ 1,624 $ 2,002
Accrued severance liability   $ 2,775 $ 3,597