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INCOME TAXES - Significant components of deferred tax assets and liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Deferred tax assets:    
Warranty costs $ 1,182 $ 1,643
Sales incentives and discounts 348 725
Stock-based compensation 611 1,015
Pension 1,406 1,993
Uniform capitalization 47 298
All others 479 489
State credits and NOL's 6,124 5,129
Valuation allowance (5,447) (4,525)
Total deferred tax assets 4,750 6,767
Deferred tax liabilities:    
Depreciation and amortization expense (781) (1,103)
Basis differences in joint venture (320) (386)
Net deferred tax assets $ 3,649 $ 5,278