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Note 16 - Share-based Compensation - Stock Options Outstanding (Details)
 9 Months Ended
Jun. 30, 2021
$ / shares
shares
Number Outstanding (in shares) | shares 2,743,718
Weighted Average Remaining Contractual Life (Year) 4 years 25 days
Weighted Average Exercise Price, Outstanding (in dollars per share) $ 3.00
Number Exercisable (in shares) | shares 1,520,058
Weighted Average Exercise Price, Exercisable (in dollars per share) $ 2.19
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 334,991
Weighted Average Remaining Contractual Life (Year) 2 years 2 months 12 days
Weighted Average Exercise Price, Outstanding (in dollars per share) $ 1.64
Number Exercisable (in shares) | shares 328,116
Weighted Average Exercise Price, Exercisable (in dollars per share) $ 1.64
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) 2 years 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) 2.16
Upper Exercise Price (in dollars per share) $ 3.17
Number Outstanding (in shares) | shares 72,500
Weighted Average Remaining Contractual Life (Year) 7 months 6 days
Weighted Average Exercise Price, Outstanding (in dollars per share) $ 2.52
Number Exercisable (in shares) | shares 72,500
Weighted Average Exercise Price, Exercisable (in dollars per share) $ 2.52
Range Four [Member]  
Lower Exercise Price (in dollars per share) 3.39
Upper Exercise Price (in dollars per share) $ 3.40
Number Outstanding (in shares) | shares 1,133,727
Weighted Average Remaining Contractual Life (Year) 5 years 4 months 2 days
Weighted Average Exercise Price, Outstanding (in dollars per share) $ 3.39
Number Exercisable (in shares) | shares 146,005
Weighted Average Exercise Price, Exercisable (in dollars per share) $ 3.40
Range Five [Member]  
Lower Exercise Price (in dollars per share) 5.05
Upper Exercise Price (in dollars per share) $ 8.03
Number Outstanding (in shares) | shares 265,000
Weighted Average Remaining Contractual Life (Year) 6 years 10 months 6 days
Weighted Average Exercise Price, Outstanding (in dollars per share) $ 6.75
Number Exercisable (in shares) | shares 35,937
Weighted Average Exercise Price, Exercisable (in dollars per share) $ 6.87