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Note 8 - Income Taxes - Income Tax Reconciliation (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Reconciliation of income tax benefit to statutory rate:    
Income benefit at statutory rate $ (10) $ (528)
State income taxes (benefit), net of federal income tax benefit 1 (40)
RTP (ISO expense) 38
Permanent differences 11 28
Change in valuation allowance (11,478) 890
Remeasurment of Deferreds 11,476
Change in state tax rate (345)
Other $ (43)