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Note 15 - Share-based Compensation - Stock Options Outstanding (Details)
 12 Months Ended
Sep. 30, 2022
$ / shares
shares
Share-Based Payment Arrangement, Option, Exercise Price Range, Shares Outstanding, Ending Balance (in shares) | shares 3,940,899
Weighted Average Remaining Contractual Life (Year) 4 years 3 months
Weighted average exercise price, outstanding balance (in dollars per share) $ 3.31
Number Exercisable (in shares) | shares 1,640,310
Weighted Average Exercise Price, Exercisable (in dollars per share) $ 2.67
Weighted Average Exercise Price, Exercisable (in shares) | shares 1,640,310
Range One [Member]  
Lower Exercise Price (in dollars per share) $ 1.31
Upper Exercise Price (in dollars per share) $ 1.86
Share-Based Payment Arrangement, Option, Exercise Price Range, Shares Outstanding, Ending Balance (in shares) | shares 243,922
Weighted Average Remaining Contractual Life (Year) 1 year 3 months 14 days
Weighted average exercise price, outstanding balance (in dollars per share) $ 1.69
Number Exercisable (in shares) | shares 243,922
Weighted Average Exercise Price, Exercisable (in dollars per share) $ 1.69
Weighted Average Exercise Price, Exercisable (in shares) | shares 243,922
Range Two [Member]  
Lower Exercise Price (in dollars per share) $ 1.99
Upper Exercise Price (in dollars per share) $ 1.99
Weighted Average Remaining Contractual Life (Year) 1 year 5 months 8 days
Weighted average exercise price, outstanding balance (in dollars per share) $ 1.99
Number Exercisable (in shares) | shares 937,500
Weighted Average Exercise Price, Exercisable (in dollars per share) $ 1.99
Weighted Average Exercise Price, Exercisable (in shares) | shares 937,500
Range Three [Member]  
Lower Exercise Price (in dollars per share) $ 3.21
Upper Exercise Price (in dollars per share) $ 3.21
Share-Based Payment Arrangement, Option, Exercise Price Range, Shares Outstanding, Ending Balance (in shares) | shares 20,000
Weighted Average Remaining Contractual Life (Year) 6 years 7 months 6 days
Weighted average exercise price, outstanding balance (in dollars per share) $ 3.21
Number Exercisable (in shares) | shares 0
Weighted Average Exercise Price, Exercisable (in shares) | shares 0
Range Four [Member]  
Lower Exercise Price (in dollars per share) $ 3.39
Upper Exercise Price (in dollars per share) $ 3.39
Share-Based Payment Arrangement, Option, Exercise Price Range, Shares Outstanding, Ending Balance (in shares) | shares 800,000
Weighted Average Remaining Contractual Life (Year) 4 years 3 days
Weighted average exercise price, outstanding balance (in dollars per share) $ 3.39
Number Exercisable (in shares) | shares 0
Weighted Average Exercise Price, Exercisable (in dollars per share) $ 0
Weighted Average Exercise Price, Exercisable (in shares) | shares 0
Range Five [Member]  
Lower Exercise Price (in dollars per share) $ 3.40
Upper Exercise Price (in dollars per share) $ 8.03
Share-Based Payment Arrangement, Option, Exercise Price Range, Shares Outstanding, Ending Balance (in shares) | shares 1,939,477
Weighted Average Remaining Contractual Life (Year) 6 years 21 days
Weighted average exercise price, outstanding balance (in dollars per share) $ 4.12
Number Exercisable (in shares) | shares 458,888
Weighted Average Exercise Price, Exercisable (in dollars per share) $ 4.59
Weighted Average Exercise Price, Exercisable (in shares) | shares 458,888