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Note 9 - Income Taxes - Effective Income Tax Rate Reconciliation (Details)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Tax on net income at federal statutory rate 21.00% 21.00%
Change in valuation allowance (5.00%) 2.00%
Stock-based compensation 74.00% 3.00%
Section 162(m) limitation on executive compensation (17.00%) (1.00%)
Book loss on equity method investment (5.00%) (1.00%)
Fair value change in warrant liability (82.00%) (24.00%)
Gain on stock acquisition 64.00%
Transaction costs (4.00%)
Tax credits 5.00%
Expired net operating losses (5.00%)
Other 1.00%
Total 47.00%