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ACCRUED LIABILITIES (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
ACCRUED LIABILITIES.    
Warranty liability $ 3,093 $ 3,078
Litigation reserve 283 325
Federal and state taxes payable 4,140 1,761
Accrued expenses & other accrued liabilities 4,302 3,644
Total $ 11,818 $ 8,808