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Income Taxes (Details 2) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Net deferred tax assets:    
Foreign net operating loss carry-forwards $ 520 $ 821
Inventory and accounts receivable 1,557 1,875
Profit sharing 4,212 3,187
Stock option compensation 502 864
Effect of inventory profit elimination 3,166 2,888
Other 222 (724)
Total gross deferred tax assets, net 10,179 8,911
Valuation allowance (520) (821)
Net deferred tax assets 9,659 8,090
Deferred tax liabilities (long-term):    
Trademarks and licenses (3,821) (3,449)
Other
Total deferred tax liabilities (3,821) (3,449)
Net deferred tax assets $ 5,838 $ 4,641