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Note 11 - Stockholders' Equity - Stock Options (Details) - $ / shares
9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Nonvested shares (in shares) 899,672  
Nonvested, Beginning balance, Weighted Average Grant-Date Fair Value (in dollars per share) $ 8.71  
Granted, shares (in shares) 640,748  
Granted, Weighted Average Grant-Date Fair Value (in dollars per share) $ 7.90 $ 7.81
Forfeited, shares (in shares) (148,051)  
ForfeitedForfeited, Weighted Average Grant-Date Fair Value (in dollars per share) $ 8.32  
Vested/Issued, shares (in shares) (443,003)  
Vested/Issued, Weighted Average Grant-Date Fair Value (in dollars per share) $ 9.52  
Nonvested shares (in shares) 949,366  
Nonvested, Beginning balance, Weighted Average Grant-Date Fair Value (in dollars per share) $ 7.85