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Note 9 - Income Taxes - Income Tax Rate Reconciliation (Details)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
U.S. federal statutory income tax expense (benefit) 21.00% 21.00%
State and local income tax, net of benefits 7.20% 6.80%
Change in fair value of derivatives (2.70%) (7.80%)
Change in tax rates 1.00%
True-up and other 1.80% 23.30%
Change in valuation allowance for deferred income tax assets (28.30%) (43.30%)
Effective income tax rate 0.00% 0.00%