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Note 16 - Share-based Compensation - Stock Option Activity (Details) - $ / shares
 12 Months Ended
Sep. 30, 2021
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) 295,000 231,270
Weighted Average Exercise Price, Shares Granted (in dollars per share) $ 6.71  
Number of Shares Forfeited/expired (in shares) (104,125)  
Weighted Average Exercise Price, Shares Forfeited/expired (in dollars per share) $ 2.57  
Number of Shares Exercised (in shares) (104,796) (583,019)
Weighted Average Exercise Price, Exercised (in dollars per share) $ 2.01  
Number of Shares Outstanding, Ending Balance (in shares) 2,745,384 2,659,305
Weighted Average Exercise Price, Shares Outstanding, Ending Balance (in dollars per share) $ 3.02 $ 2.56
Number of Shares Exercisable (in shares) 1,541,176  
Weighted Average Exercise Price, Shares Exercisable (in dollars per share) $ 2.24