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Note 8 - Income Taxes - Effective Income Tax Rate Reconciliation (Details)
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Federal statutory tax 21.00% 21.00% 21.00%
State tax, net of federal benefit 7.00% 39.00% 0.00%
Stock compensation 38.00% 538.00% 74.00%
Sec. 162(m) limitation on executive compensation (12.00%) (35.00%) (17.00%)
Fair value change in contingent consideration (2.00%) (81.00%) 0.00%
Fair value change in warrant liability 0.00% 127.00% (82.00%)
Transaction costs (1.00%) (6.00%) (4.00%)
Gain on stock acquisition 5.00% 0.00% 64.00%
Tax credits 0.00% 12.00% 5.00%
Change in valuation allowance 21.00% 35.00% (5.00%)
Book loss on equity method investment 0.00% 0.00% (5.00%)
Expired net operating losses (5.00%) (100.00%) (5.00%)
Other 0.00% (3.00%) 1.00%
Total 72.00% 547.00% 47.00%