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INCOME TAXES - Significant components of deferred tax assets and liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Deferred tax assets:    
Warranty costs $ 1,209 $ 1,362
Sales incentives and discounts 547 512
Stock-based compensation 1,061 996
Pension 2,300 2,499
All others 514 444
State credits and NOL's 4,967 4,674
Valuation allowance (4,694) (4,401)
Total deferred tax assets 5,904 6,086
Deferred tax liabilities:    
Depreciation and amortization expense (1,062) (392)
Basis differences in joint venture (504)  
Net deferred tax assets $ 4,338 $ 5,694