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Note 9 - Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Deferred Tax Liabilities:    
Property, Plant and Equipment
Other 38
Intangible Assets 3,806 5,471
Total Deferred Tax Liabilities 3,844 5,471
Deferred Tax Assets:    
Property, Plant and Equipment 44 77
Net Operating Loss Carryforwards 17,870 27,127
Tax Credit Carryforwards 1,837 1,704
Intangible Assets 1,535 2,923
Accrued Expenses, Reserves and Other 1,359 1,527
Total Deferred Tax Assets 22,645 33,358
Valuation Allowance for Deferred Tax Assets (22,636) (33,331)
Net Deferred Tax Assets 9 27
Net Deferred Tax Liabilities $ 3,835 $ 5,444