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SUPPLEMENTAL CONSOLIDATED BALANCE SHEETS INFORMATION (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Warranty provision [Member]      
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance, beginning $ 235 $ 285 $ 306
Additions 80 115 214
Deductions (65) (165) (235)
Balance, ending 250 235 285
Provision for current expected credit losses [Member]      
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance, beginning 314 276 623
Additions 194 84 135
Deductions (202) (46) (482)
Balance, ending $ 306 $ 314 $ 276