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Note 15 - Share-based Compensation - Stock Options Outstanding (Details)
 3 Months Ended
Dec. 31, 2021
$ / shares
shares
Lower Exercise Price (in dollars per share) $ 3.40
Number Outstanding (in shares) | shares 2,997,384
Weighted Average Remaining Contractual Life (Year) 3 years 10 months 9 days
Weighted Average Exercise Price, Outstanding (in dollars per share) $ 3.20
Number Exercisable (in shares) | shares 1,562,503
Weighted Average Exercise Price, Exercisable (in dollars per share) $ 2.29
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 324,157
Weighted Average Remaining Contractual Life (Year) 1 year 9 months
Weighted Average Exercise Price, Outstanding (in dollars per share) $ 1.64
Number Exercisable (in shares) | shares 324,157
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 2 months 4 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) $ 2.90
Number Outstanding (in shares) | shares 50,000
Weighted Average Remaining Contractual Life (Year) 2 months 8 days
Weighted Average Exercise Price, Outstanding (in dollars per share) $ 2.31
Number Exercisable (in shares) | shares 50,000
Weighted Average Exercise Price, Exercisable (in dollars per share) $ 2.31
Range Four [Member]  
Lower Exercise Price (in dollars per share) 3.39
Upper Exercise Price (in dollars per share) $ 3.39
Number Outstanding (in shares) | shares 800,000
Weighted Average Remaining Contractual Life (Year) 4 years 9 months 3 days
Weighted Average Exercise Price, Outstanding (in dollars per share) $ 3.39
Number Exercisable (in shares) | shares 0
Weighted Average Exercise Price, Exercisable (in dollars per share) $ 0
Range Five [Member]  
Upper Exercise Price (in dollars per share) $ 8.03
Number Outstanding (in shares) | shares 885,727
Weighted Average Remaining Contractual Life (Year) 5 years 9 months 21 days
Weighted Average Exercise Price, Outstanding (in dollars per share) $ 4.93
Number Exercisable (in shares) | shares 250,846
Weighted Average Exercise Price, Exercisable (in dollars per share) $ 4.27