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Note 5 - Stockholders' Equity (Deficit) - Schedule of Black Pricing Model With Range of Inputs (Details) - $ / shares
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Granted, shares (in shares) 0 0
Restricted Stock Units (RSUs) [Member]    
Unvested, shares (in shares) 515,352 303,150
Unvested, Weighted average grant date fair value per share (in dollars per share) $ 6.12 $ 3.58
Granted, shares (in shares) 1,119,323 606,500
Granted, Weighted average grant date fair value per share (in dollars per share) $ 11.68 $ 5.94
Exercised (in shares)   (284,648)
Exercised (in shares)   3.64
Forfeited or expired, shares (in shares) (108,343) (109,650)
Forfeited or expired, Weighted average grant date fair value per share (in dollars per share) $ 8.03 $ 3.05
Vested (in shares) (756,846)  
Vested, Weighted average grant date fair value per share (in dollars per share) $ 9.71  
Unvested, shares (in shares) 769,486 515,352
Unvested, Weighted average grant date fair value per share (in dollars per share) $ 10.46 $ 6.12