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Note 7 - Income Taxes - Effective Income Tax Rate Reconciliation (Details)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Federal statutory rate (21.00%) (21.00%)
State income taxes, net of Federal benefits (5.00%) (5.30%)
Rate changes 3.80% (6.40%)
Change in fair value of liability classified warrants 0.00% (1.60%)
Warrant inducement expense 9.00% 0.00%
Other, including non-deductible expenses 26.00% 28.80%
Valuation allowance (12.80%) 5.50%
Total 0.00% 0.00%