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Note 15 - Share-based Compensation - Stock Option Activity (Details)
 9 Months Ended
Jun. 30, 2020
$ / shares
shares
Jun. 30, 2019
shares
Number of Shares Outstanding, Beginning Balance (in shares) | shares 2,219,268  
Weighted Average Exercise Price, Shares Outstanding, Beginning Balance (in dollars per share) | $ / shares $ 1.94  
Number of Shares Granted (in shares) | shares 1,133,727 0
Weighted Average Exercise Price, Shares Granted (in dollars per share) | $ / shares $ 3.39  
Number of Shares Forfeited/expired (in shares) | shares (110,546)  
Weighted Average Exercise Price, Shares Forfeited/expired (in dollars per share) | $ / shares $ 2.11  
Number of Shares Exercised (in shares) | shares (512,019) (35,282)
Weighted Average Exercise Price, Exercised (in dollars per share) | $ / shares $ 1.95  
Number of Shares Outstanding, Ending Balance (in shares) | shares 2,730,430  
Weighted Average Exercise Price, Shares Outstanding, Ending Balance (in dollars per share) | $ / shares $ 2.54  
Number of Shares Exercisable (in shares) | shares 1,153,024  
Weighted Average Exercise Price, Shares Exercisable (in dollars per share) | $ / shares $ 2