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Note 12 - Share-based Compensation - Stock Options Outstanding (Details)
 12 Months Ended
Sep. 30, 2017
$ / shares
shares
Lower Exercise Price (in dollars per share) $ 0.93
Upper Exercise Price (in dollars per share) $ 3.17
Number Outstanding (in shares) | shares 4,663,502
Weighted Average Remaining Contractual Life (Year) 3 years 149 days
Weighted Average Exercise Price (in dollars per share) $ 2.18
Number Exercisable (in shares) | shares 3,329,437
Weighted Average Exercise Price (in dollars per share) $ 2.25
Range One [Member]  
Lower Exercise Price (in dollars per share) 0.93
Upper Exercise Price (in dollars per share) $ 1.76
Number Outstanding (in shares) | shares 1,332,752
Weighted Average Remaining Contractual Life (Year) 4 years 127 days
Weighted Average Exercise Price (in dollars per share) $ 1.65
Number Exercisable (in shares) | shares 1,036,036
Weighted Average Exercise Price (in dollars per share) $ 1.63
Range Two [Member]  
Lower Exercise Price (in dollars per share) 1.77
Upper Exercise Price (in dollars per share) $ 1.99
Number Outstanding (in shares) | shares 1,654,500
Weighted Average Remaining Contractual Life (Year) 4 years 229 days
Weighted Average Exercise Price (in dollars per share) $ 1.93
Number Exercisable (in shares) | shares 626,526
Weighted Average Exercise Price (in dollars per share) $ 1.89
Range Three [Member]  
Lower Exercise Price (in dollars per share) 2
Upper Exercise Price (in dollars per share) $ 2.85
Number Outstanding (in shares) | shares 905,000
Weighted Average Remaining Contractual Life (Year) 2 years 113 days
Weighted Average Exercise Price (in dollars per share) $ 2.57
Number Exercisable (in shares) | shares 902,500
Weighted Average Exercise Price (in dollars per share) $ 2.57
Range Four [Member]  
Lower Exercise Price (in dollars per share) 2.86
Upper Exercise Price (in dollars per share) $ 3.13
Number Outstanding (in shares) | shares 761,250
Weighted Average Remaining Contractual Life (Year) 1 year 105 days
Weighted Average Exercise Price (in dollars per share) $ 3
Number Exercisable (in shares) | shares 757,500
Weighted Average Exercise Price (in dollars per share) $ 3
Range Five [Member]  
Lower Exercise Price (in dollars per share) 3.14
Upper Exercise Price (in dollars per share) $ 3.17
Number Outstanding (in shares) | shares 10,000
Weighted Average Remaining Contractual Life (Year) 4 years 51 days
Weighted Average Exercise Price (in dollars per share) $ 3.17
Number Exercisable (in shares) | shares 6,875
Weighted Average Exercise Price (in dollars per share) $ 3.17