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INCOME TAXES - Significant components of deferred tax assets and liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Deferred tax assets:    
Warranty costs $ 1,643 $ 1,209
Sales incentives and discounts 725 547
Stock-based compensation 1,015 1,061
Pension 1,993 2,300
Uniform capitalization 298 96
All others 489 418
State credits and NOL's 5,129 4,967
Valuation allowance (4,525) (4,694)
Total deferred tax assets 6,767 5,904
Deferred tax liabilities:    
Depreciation and amortization expense (1,103) (1,062)
Basis differences in joint venture (386) (504)
Net deferred tax assets $ 5,278 $ 4,338