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Note 15 - Share-based Compensation - Stock Option Activity (Details) - $ / shares
 3 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Number of Shares Outstanding, Balance (in shares) 2,745,384  
Weighted Average Exercise Price, Shares Outstanding, Balance (in dollars per share) $ 3.02  
Number of Shares Granted (in shares) 267,000 215,000
Weighted Average Exercise Price, Shares Granted (in dollars per share) $ 4.99  
Number of Shares Forfeited/expired (in shares) 0  
Weighted Average Exercise Price, Shares Forfeited/expired (in dollars per share) $ 0  
Number of Shares Exercised (in shares) (15,000) (25,899)
Weighted Average Exercise Price, Exercised (in dollars per share) $ 3.06  
Number of Shares Outstanding, Balance (in shares) 2,997,384  
Weighted Average Exercise Price, Shares Outstanding, Balance (in dollars per share) $ 3.20  
Number of Shares Exercisable (in shares) 1,562,503  
Weighted Average Exercise Price, Shares Exercisable (in dollars per share) $ 2.29