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INCOME TAXES - Significant components of deferred tax assets and liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Deferred tax assets:
Warranty costs	$ 1,233	$ 1,182
Sales incentives and discounts	317	348
Stock-based compensation	667	611
Pension	1,337	1,406
Uniform capitalization	44	47
All others	515	479
State credits and NOL's	3,382	6,124
Valuation allowance	(2,794)	(5,447)
Total deferred tax assets	4,701	4,750
Deferred tax liabilities:
Depreciation and amortization expense	(1,009)	(781)
Basis differences in joint venture	(367)	(320)
Net deferred tax assets	$ 3,325	$ 3,649

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