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Note 15 - Share-based Compensation - Stock Option Activity (Details)
 6 Months Ended
Mar. 31, 2022
$ / shares
shares
Mar. 31, 2021
shares
Number of Shares Outstanding, Balance (in shares) | shares 2,745,384  
Weighted Average Exercise Price, Shares Outstanding, Balance (in dollars per share) | $ / shares $ 3.02  
Number of Shares Granted (in shares) | shares 302,000 245,000
Weighted Average Exercise Price, Shares Granted (in dollars per share) | $ / shares $ 4.87  
Number of Shares Forfeited/expired (in shares) | shares 0  
Weighted Average Exercise Price, Shares Forfeited/expired (in dollars per share) | $ / shares $ 0  
Number of Shares Exercised (in shares) | shares (70,000) (86,462)
Weighted Average Exercise Price, Exercised (in dollars per share) | $ / shares $ 2.43  
Number of Shares Outstanding, Balance (in shares) | shares 2,977,384  
Weighted Average Exercise Price, Shares Outstanding, Balance (in dollars per share) | $ / shares $ 3.23  
Number of Shares Exercisable (in shares) | shares 1,562,503  
Weighted Average Exercise Price, Shares Exercisable (in dollars per share) | $ / shares $ 2.42