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Note 15 - Share-based Compensation - Stock Options Outstanding (Details)
 9 Months Ended
Jun. 30, 2022
$ / shares
shares
Number Outstanding (in shares) | shares 2,927,384
Weighted Average Remaining Contractual Life (Year) 3 years 6 months 10 days
Weighted Average Exercise Price, Outstanding (in dollars per share) $ 3.26
Number Exercisable (in shares) | shares 1,589,114
Weighted Average Exercise Price, Exercisable (in dollars per share) $ 2.57
Range One [Member]  
Lower Exercise Price (in dollars per share) 1.31
Upper Exercise Price (in dollars per share) $ 1.86
Number Outstanding (in shares) | shares 259,157
Weighted Average Remaining Contractual Life (Year) 1 year 6 months 10 days
Weighted Average Exercise Price, Outstanding (in dollars per share) $ 1.70
Number Exercisable (in shares) | shares 259,157
Weighted Average Exercise Price, Exercisable (in dollars per share) $ 1.70
Range Two [Member]  
Lower Exercise Price (in dollars per share) 1.99
Upper Exercise Price (in dollars per share) $ 1.99
Number Outstanding (in shares) | shares 937,500
Weighted Average Remaining Contractual Life (Year) 1 year 8 months 8 days
Weighted Average Exercise Price, Outstanding (in dollars per share) $ 1.99
Number Exercisable (in shares) | shares 937,500
Weighted Average Exercise Price, Exercisable (in dollars per share) $ 1.99
Range Three [Member]  
Lower Exercise Price (in dollars per share) 0
Upper Exercise Price (in dollars per share) $ 3.21
Number Outstanding (in shares) | shares 20,000
Weighted Average Remaining Contractual Life (Year) 6 years 10 months 6 days
Weighted Average Exercise Price, Outstanding (in dollars per share) $ 3.21
Number Exercisable (in shares) | shares 0
Weighted Average Exercise Price, Exercisable (in dollars per share) $ 0
Range Four [Member]  
Lower Exercise Price (in dollars per share) 3.39
Upper Exercise Price (in dollars per share) $ 3.39
Number Outstanding (in shares) | shares 800,000
Weighted Average Remaining Contractual Life (Year) 4 years 3 months 3 days
Weighted Average Exercise Price, Outstanding (in dollars per share) $ 3.39
Number Exercisable (in shares) | shares 0
Weighted Average Exercise Price, Exercisable (in dollars per share) $ 0
Range Five [Member]  
Lower Exercise Price (in dollars per share) 0
Upper Exercise Price (in dollars per share) $ 8.03
Number Outstanding (in shares) | shares 910,727
Weighted Average Remaining Contractual Life (Year) 5 years 3 months 10 days
Weighted Average Exercise Price, Outstanding (in dollars per share) $ 4.88
Number Exercisable (in shares) | shares 392,457
Weighted Average Exercise Price, Exercisable (in dollars per share) $ 4.53