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Note 15 - Share-based Compensation - Stock Options Outstanding (Details)
 6 Months Ended
Mar. 31, 2024
$ / 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 3,377,824
Weighted Average Remaining Contractual Life (Year) 5 years 1 month 9 days
Weighted average exercise price, outstanding balance (in dollars per share) $ 2.84
Number Exercisable (in shares) | shares 1,097,178
Exercisable, Weighted Average Exercise Price (in dollars per share) $ 3.49
Range One [Member]  
Lower Exercise Price (in dollars per share) 1.51
Upper Exercise Price (in dollars per share) $ 1.76
Number Outstanding (in shares) | shares 910,375
Weighted Average Remaining Contractual Life (Year) 6 years
Weighted average exercise price, outstanding balance (in dollars per share) $ 1.71
Number Exercisable (in shares) | shares 103,125
Exercisable, Weighted Average Exercise Price (in dollars per share) $ 1.75
Range Two [Member]  
Lower Exercise Price (in dollars per share) 2.64
Upper Exercise Price (in dollars per share) $ 2.68
Number Outstanding (in shares) | shares 88,000
Weighted Average Remaining Contractual Life (Year) 6 years 3 months 3 days
Weighted average exercise price, outstanding balance (in dollars per share) $ 2.67
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) 2.69
Upper Exercise Price (in dollars per share) $ 2.69
Number Outstanding (in shares) | shares 1,031,250
Weighted Average Remaining Contractual Life (Year) 5 years 4 months 13 days
Weighted average exercise price, outstanding balance (in dollars per share) $ 2.69
Number Exercisable (in shares) | shares 131,250
Exercisable, Weighted Average Exercise Price (in dollars per share) $ 2.69
Range Four [Member]  
Lower Exercise Price (in dollars per share) 3.09
Upper Exercise Price (in dollars per share) $ 8.03
Number Outstanding (in shares) | shares 1,348,199
Weighted Average Remaining Contractual Life (Year) 4 years 2 months 23 days
Weighted average exercise price, outstanding balance (in dollars per share) $ 3.73
Number Exercisable (in shares) | shares 862,803
Exercisable, Weighted Average Exercise Price (in dollars per share) $ 3.82