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Note 7 - Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Property, Plant and Equipment $ 168 $ 44
Net Operating Loss Carryforwards 15,622 16,838
Tax Credit Carryforwards 1,817 1,837
Intangible Assets 1,231 1,535
Accrued Expenses, Reserves and Other 1,838 1,359
Total Deferred Tax Assets 20,676 21,613
Valuation Allowance for Deferred Tax Assets (1,942) (21,604)
Net Deferred Tax Assets 18,734 9
Other (25) (38)
Intangible Assets (3,856) (3,806)
Total Deferred Tax Liabilities (3,881) (3,844)
Net Deferred Tax Assets (Liabilities) $ 14,853  
Net Deferred Tax Assets (Liabilities)   $ (3,835)