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Note 9 - Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Deferred Tax Liabilities:    
Property, Plant and Equipment
Intangible Assets 5,471 4,631
Total Deferred Tax Liabilities 5,471 4,631
Deferred Tax Assets:    
Property, Plant and Equipment 77 288
Net Operating Loss Carry-Forwards 27,127 27,283
Tax Credit Carry-Forwards 1,704 1,596
Intangible Assets 2,923 3,391
Accrued Expenses, Reserves and Other 1,527 2,127
Total Deferred Tax Assets 33,358 34,685
Valuation Allowance for Deferred Tax Assets (33,331) (34,593)
Net Deferred Tax Assets 27 92
Net Deferred Tax Liabilities $ 5,444 $ 4,539