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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

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