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Note 7 - Income Taxes - Reconciliation of Effective Income Tax Rate (Details)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Federal statutory rate 21.00% 21.00%
State tax, net of federal benefit 3.80% 2.30%
State tax credits and adjustments (122.70%) (11.80%)
Change in federal tax rate
Alternative minimum tax 67.70%
Valuation allowance increase (3.90%) (11.50%)
Other, net 4.30% 14.50%
Effective income tax rate (97.60%) 82.20%