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Note 15 - Share-based Compensation - Stock Option Activity (Details)
 6 Months Ended 18 Months Ended
Mar. 31, 2020
$ / shares
shares
Mar. 31, 2019
shares
Mar. 31, 2020
$ / shares
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 (109,233)    
Weighted Average Exercise Price, Shares Forfeited/expired (in dollars per share) | $ / shares $ 2.11    
Number of Shares Exercised (in shares) | shares (140,204) (28,282)  
Weighted Average Exercise Price, Exercised (in dollars per share) | $ / shares $ 1.84    
Number of Shares Outstanding, Ending Balance (in shares) | shares 3,103,558   3,103,558
Weighted Average Exercise Price, Shares Outstanding, Ending Balance (in dollars per share) | $ / shares $ 2.48   $ 2.48
Number of Shares Exercisable (in shares) | shares 1,495,857   1,495,857
Weighted Average Exercise Price, Shares Exercisable (in dollars per share) | $ / shares $ 1.98   $ 1.98