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INCOME TAXES - Significant components of deferred tax assets and liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Deferred tax assets:    
Warranty costs $ 1,190 $ 1,233
Sales incentives and discounts 404 317
Stock-based compensation 696 667
Pension 2,002 1,337
State NOL's 484 588
State credits 1,818 2,794
All others 560 559
Valuation allowance (1,818) (2,794)
Total deferred tax assets 5,336 4,701
Deferred tax liabilities:    
Depreciation and amortization expense (947) (1,009)
Basis differences in joint venture (399) (367)
Net deferred tax assets $ 3,990 $ 3,325