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Note 18 - Income Taxes - Effective Income Tax Rate Reconciliation (Details)
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Statutory rate 21.00% 21.00% 21.00%
State tax 11.20% 3.20% 3.10%
Change in valuation allowance (47.70%) (11.70%) (23.00%)
Warrant/equity expenses 16.70% (10.30%) 1.70%
Stock-based compensation expense (1.10%) (4.00%) (3.70%)
Other (0.10%) 1.70% (0.30%)
Impact of 162m 0.00% 0.00% 1.10%
Total 0.00% (0.10%) (0.10%)