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Note 15 - Share-based Compensation - Stock Options Outstanding (Details)
 9 Months Ended
Jun. 30, 2023
$ / shares
shares
Lower Exercise Price (in dollars per share) $ 1.51
Upper Exercise Price (in dollars per share) $ 8.03
Number Outstanding (in shares) | shares 3,287,772
Weighted Average Remaining Contractual Life (Year) 5 years 1 month 28 days
Weighted average exercise price, outstanding balance (in dollars per share) $ 3.21
Number Exercisable (in shares) | shares 817,726
Exercisable, Weighted Average Exercise Price (in dollars per share) $ 3.41
Range One [Member]  
Lower Exercise Price (in dollars per share) 1.51
Upper Exercise Price (in dollars per share) $ 2.64
Number Outstanding (in shares) | shares 189,157
Weighted Average Remaining Contractual Life (Year) 1 year 10 months 17 days
Weighted average exercise price, outstanding balance (in dollars per share) $ 1.88
Number Exercisable (in shares) | shares 159,157
Exercisable, Weighted Average Exercise Price (in dollars per share) $ 1.73
Range Two [Member]  
Lower Exercise Price (in dollars per share) 2.69
Upper Exercise Price (in dollars per share) $ 2.69
Number Outstanding (in shares) | shares 1,100,000
Weighted Average Remaining Contractual Life (Year) 6 years 3 months 7 days
Weighted average exercise price, outstanding balance (in dollars per share) $ 2.69
Number Exercisable (in shares) | shares 0
Exercisable, Weighted Average Exercise Price (in dollars per share) $ 0
Range Three [Member]  
Lower Exercise Price (in dollars per share) 3.09
Upper Exercise Price (in dollars per share) $ 3.39
Number Outstanding (in shares) | shares 1,160,388
Weighted Average Remaining Contractual Life (Year) 4 years 11 months 4 days
Weighted average exercise price, outstanding balance (in dollars per share) $ 3.33
Number Exercisable (in shares) | shares 192,138
Exercisable, Weighted Average Exercise Price (in dollars per share) $ 3.39
Range Four [Member]  
Lower Exercise Price (in dollars per share) 3.40
Upper Exercise Price (in dollars per share) $ 8.03
Number Outstanding (in shares) | shares 838,227
Weighted Average Remaining Contractual Life (Year) 4 years 9 months 3 days
Weighted average exercise price, outstanding balance (in dollars per share) $ 4.04
Number Exercisable (in shares) | shares 466,431
Exercisable, Weighted Average Exercise Price (in dollars per share) $ 3.99