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ACCRUED LIABILITIES (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
ACCRUED LIABILITIES.    
Warranty liability $ 2,494 $ 2,594
Litigation reserve 607 899
Federal and state income taxes payable 5,353 5,603
Accrued expenses & other accrued liabilities 8,619 6,394
Total $ 17,073 $ 15,490