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Note 4 - Income Taxes - Reconciliation Between Statutory Tax Rate (Details)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Tax at U.S. statutory rate (21.00%) (21.00%)
State taxes, net of federal benefit (3.60%) (4.61%)
Non-deductible items (0.45%) (6.49%)
Change in valuation allowance 24.19% 30.99%
True-up adjustment 1.33% 0.18%
Foreign operations (0.13%) (0.07%)
Change in tax rates 0.00% 1.00%
Other (0.34%) 0.00%
Effective income tax rate 0.00% 0.00%