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Note 12 - Income Taxes - Effective Income Tax Reconciliation (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Tax at federal statutory rate $ (5,787) $ (16,565)
Federal Tax rate remeasurement 35,953
State taxes, net of federal benefit (1,023) 993
Permanent differences 228 525
Change in valuation allowance 6,582 (22,554)
Research credits (229)
Other 1,877
Provision for taxes