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Income Taxes Components of deferred tax assets and liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Deferred tax assets:    
Net operating loss carryforward $ 17,518 $ 19,336
Compensation and benefits 12,126 11,979
Inventory reserve 2,750 2,726
Capital Loss Carryforward 2,210 2,210
Accounts receivable reserve 183 218
Other 1,770 2,073
Total deferred tax assets 36,557 38,542
Deferred tax liabilities:    
Property, plant and equipment 433 1,100
Other 688 875
Total deferred liabilities 1,121 1,975
Net deferred assets before valuation allowance 35,436 36,567
Valuation allowance (35,416) (36,516)
Net deferred assets $ 20 $ 51