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Note 5 - Income Taxes - Reconciliation of Effective Income Tax Rate (Details)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Federal statutory rate 21.00% 35.00%
State tax, net of federal benefit 2.30% (12.30%)
State tax credits and adjustments (11.80%) (1.70%)
Change in federal tax rate (54.60%)
Alternative minimum tax 67.70%
Valuation allowance increase (11.50%) 38.80%
Other, net 14.50% (4.70%)
Effective income tax rate 82.20% 0.50%