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Note 16 - Share-based Compensation - Stock Options Outstanding (Details) - $ / shares
 6 Months Ended 9 Months Ended
Mar. 31, 2024
Jun. 30, 2024
Lower Exercise Price (in dollars per share)   $ 1.51
Upper Exercise Price (in dollars per share)   $ 6.87
Number Outstanding (in shares)   3,365,740
Weighted Average Remaining Contractual Life (Year)   4 years 10 months 24 days
Weighted average exercise price, outstanding balance (in dollars per share)   $ 2.82
Number Exercisable (in shares)   1,096,854
Exercisable, Weighted Average Exercise Price (in dollars per share)   $ 3.52
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)   900,375
Weighted Average Remaining Contractual Life (Year)   5 years 7 months 6 days
Weighted average exercise price, outstanding balance (in dollars per share)   $ 1.71
Number Exercisable (in shares)   103,125
Exercisable, Weighted Average Exercise Price (in dollars per share)   $ 1.75
Range Two [Member]    
Lower Exercise Price (in dollars per share)   2.2
Upper Exercise Price (in dollars per share)   $ 2.68
Number Outstanding (in shares)   133,000
Weighted Average Remaining Contractual Life (Year)   6 years 3 months 18 days
Weighted average exercise price, outstanding balance (in dollars per share)   $ 2.51
Number Exercisable (in shares)   7,500
Exercisable, Weighted Average Exercise Price (in dollars per share)   $ 2.64
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)   1,000,000
Weighted Average Remaining Contractual Life (Year)   5 years 3 months 7 days
Weighted average exercise price, outstanding balance (in dollars per share)   $ 2.69
Number Exercisable (in shares)   100,000
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)   $ 6.87
Number Outstanding (in shares)   1,332,365
Weighted Average Remaining Contractual Life (Year)   4 years 7 days
Weighted average exercise price, outstanding balance (in dollars per share)   $ 3.71
Number Exercisable (in shares)   886,229
Exercisable, Weighted Average Exercise Price (in dollars per share)   $ 3.82