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INCOME TAXES - Significant components of deferred tax assets and liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Deferred tax assets:
Warranty costs	$ 1,107	$ 1,190
Sales incentives and discounts	278	404
Stock-based compensation	717	696
Pension	2,365	2,002
State NOL's	423	484
State credits	1,818	1,818
All others	635	560
Valuation allowance	(1,818)	(1,818)
Total deferred tax assets	5,525	5,336
Deferred tax liabilities:
Depreciation and amortization expense	(965)	(947)
Basis differences in joint venture	(485)	(399)
Net deferred tax assets	$ 4,075	$ 3,990

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Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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