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Note 16 - Share-based Compensation - Stock Options Outstanding (Details)
 6 Months Ended
Mar. 31, 2021
$ / shares
shares
Number Outstanding (in shares) | shares 2,723,718
Weighted Average Remaining Contractual Life (Year) 4 years 98 days
Weighted Average Exercise Price, Outstanding (in dollars per share) $ 3
Number Exercisable (in shares) | shares 1,480,606
Weighted Average Exercise Price, Exercisable (in dollars per share) $ 2.14
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 182 days
Weighted Average Exercise Price, Outstanding (in dollars per share) $ 1.64
Number Exercisable (in shares) | shares 321,241
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 343 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) 310 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 215 days
Weighted Average Exercise Price, Outstanding (in dollars per share) $ 3.39
Number Exercisable (in shares) | shares 125,147
Weighted Average Exercise Price, Exercisable (in dollars per share) $ 3.40
Range Five [Member]  
Lower Exercise Price (in dollars per share) 6.87
Upper Exercise Price (in dollars per share) $ 8.03
Number Outstanding (in shares) | shares 245,000
Weighted Average Remaining Contractual Life (Year) 6 years 259 days
Weighted Average Exercise Price, Outstanding (in dollars per share) $ 7.01
Number Exercisable (in shares) | shares 24,218
Weighted Average Exercise Price, Exercisable (in dollars per share) $ 6.87