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INCOME TAXES - Significant components of deferred tax assets and liabilities (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Deferred tax assets:        
Warranty costs $ 895 $ 701    
Sales incentives and discounts 942 750    
Stock-based compensation 838 755    
Pension 2,212 2,242    
All others 331 267    
State credits and NOL's 4,450 4,099    
Valuation allowance (4,155) (3,783) (3,677) (3,459)
Total deferred tax assets 5,513 5,031    
Deferred tax liabilities:        
Depreciation and amortization expense (699) (673)    
Net deferred tax assets $ 4,814 $ 4,358