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Note 5 - Income Taxes - Reconciliation of Effective Rate with Federal Statutory Rate (Details)
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Federal statutory rate 21.00% 21.00% 21.00%
State income taxes, net of federal benefit 10.40% 4.40% (4.50%)
Permanent differences 47.60% 0.00% (8.10%)
Stock based compensation 1.40% (0.40%) 1.30%
Federal R&D Credits 0.00% 1.60% (4.70%)
Foreign taxes, net of federal benefit (10.90%) (2.20%) 44.50%
Difference in tax rate for carryback claim 0.00% 13.40% 0.00%
Increase/(decrease) in valuation reserve (50.50%) 0.00% 0.00%
Effective tax rate 19.00% 37.80% 49.50%