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Income Taxes Components of deferred tax assets and liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Deferred tax assets:    
Net operating loss carryforward $ 9,878 $ 12,120
Compensation and benefits 9,598 7,828
Inventory reserve 1,769 1,689
Capital Loss Carryforward 1,317 1,326
Accounts receivable reserve 142 130
Other 457 1,155
Total deferred tax assets 23,161 24,248
Deferred Tax Liabilities, Intangible Assets 2,478 3,115
Deferred tax liabilities:    
Property, plant and equipment (20) 41
Other 303 403
Total deferred liabilities 2,761 3,559
Net deferred assets before valuation allowance 20,400 20,689
Valuation allowance (2,569) (2,556)
Net deferred assets $ 17,831 $ 18,133