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Note 5 - Income Taxes - Reconciliation of Effective Rate with Federal Statutory Rate (Details)
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Federal statutory rate 21.00% 21.00% 21.00%
State income taxes, net of federal benefit 12.00% 10.40% 4.40%
Permanent differences (0.40%) 47.60% 0.00%
Stock based compensation 0.50% 1.40% (0.40%)
Federal R&D Credits 8.90% 0.00% 1.60%
Foreign taxes, net of federal benefit 0.00% (10.90%) (2.20%)
Difference in tax rate for carryback claim 0.00% 0.00% 13.40%
Increase/(decrease) in valuation reserve (46.20%) (50.50%) 0.00%
Effective tax rate (4.20%) 19.00% 37.80%