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INCOME TAXES - Significant components of deferred tax assets and liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Deferred tax assets:
Warranty costs	$ 1,021	$ 1,107
Sales incentives and discounts	83	278
Stock-based compensation	780	717
Pension	3,196	2,365
State NOL's	283	423
State credits		1,818
All others	506	635
Valuation allowance		(1,818)
Total deferred tax assets	5,869	5,525
Deferred tax liabilities:
Depreciation and amortization expense	(1,033)	(965)
Basis differences in joint venture	(444)	(485)
Net deferred tax assets	$ 4,392	$ 4,075

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