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Note 4 - Income Taxes - Reconciliation Between Statutory Tax Rate (Details)
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Tax at U.S. statutory rate (21.00%) (21.00%)
State taxes, net of federal benefit (4.52%) (3.60%)
Non-deductible items (0.84%) (0.45%)
Change in valuation allowance 28.09% 24.19%
True-up adjustment 0.06% 1.33%
Foreign operations 0.09% (0.13%)
Change in tax rate (1.88%) 0.00%
Other 0.00% (0.34%)
Effective income tax rate 0.00% 0.00%