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Note 16 - Share-based Compensation - Stock Option Activity (Details) - $ / shares
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Sep. 30, 2020
Number of Shares Outstanding, Beginning Balance (in shares) 2,659,305    
Weighted Average Exercise Price, Shares Outstanding, Beginning Balance (in dollars per share) $ 2.56    
Number of Shares Granted (in shares) 215,000   1,133,727
Weighted Average Exercise Price, Shares Granted (in dollars per share) $ 6.87    
Number of Shares Forfeited/expired (in shares) (94,125)    
Weighted Average Exercise Price, Shares Forfeited/expired (in dollars per share) $ 1.99    
Number of Shares Exercised (in shares) (25,899) (83,343)  
Weighted Average Exercise Price, Exercised (in dollars per share) $ 2.06    
Number of Shares Outstanding, Ending Balance (in shares) 2,754,281   2,659,305
Weighted Average Exercise Price, Shares Outstanding, Ending Balance (in dollars per share) $ 2.92   $ 2.56
Number of Shares Exercisable (in shares) 1,500,749    
Weighted Average Exercise Price, Shares Exercisable (in dollars per share) $ 2.08