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Note 9 - Income Taxes - Reconciliation of the Statutory Tax Rate to the Effective Rate (Details)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Federal statutory rate 34.00% 34.00%
State taxes, net of federal tax benefit 6.60% 5.50%
Change in valuation allowance and deferred rate change, net (40.60%) (39.50%)
Effective tax rate