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Income Taxes (Schedule of Deferred Tax Assets and Liabilities) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Deferred tax assets:    
Product liability $ 201 $ 655
Employee compensation and benefits 2,336 3,627
Allowances for doubtful accounts and discounts 1,769 3,813
Inventories 758 981
Stock-based compensation 1,406 2,527
Other 1,326 1,533
Total deferred tax assets 7,796 13,136
Deferred tax liabilities:    
Depreciation 8,956 12,457
Other 242 345
Total deferred tax liabilities 9,198 12,802
Net deferred tax (liabilities) assets $ (1,402) $ 334