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Note 12 - Share-based Compensation - Stock Options Outstanding (Details)
 12 Months Ended
Sep. 30, 2016
$ / shares
shares
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 969,752
Weighted Average Remaining Contractual Life 5 years 18 days
Weighted Average Exercise Price (in dollars per share) $ 1.59
Number Exercisable (in shares) | shares 831,063
Weighted Average Exercise Price (in dollars per share) $ 1.59
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 1,756,750
Weighted Average Remaining Contractual Life 6 years 222 days
Weighted Average Exercise Price (in dollars per share) $ 1.94
Number Exercisable (in shares) | shares 365,362
Weighted Average Exercise Price (in dollars per share) $ 1.86
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 906,250
Weighted Average Remaining Contractual Life 5 years 10 days
Weighted Average Exercise Price (in dollars per share) $ 2.57
Number Exercisable (in shares) | shares 855,817
Weighted Average Exercise Price (in dollars per share) $ 2.56
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 5 years 222 days
Weighted Average Exercise Price (in dollars per share) $ 3
Number Exercisable (in shares) | shares 755,000
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 5 years 51 days
Weighted Average Exercise Price (in dollars per share) $ 3.17
Number Exercisable (in shares) | shares 4,375
Weighted Average Exercise Price (in dollars per share) $ 3.17
Range Six [Member]  
Lower Exercise Price (in dollars per share) 0.93
Upper Exercise Price (in dollars per share) $ 3.17
Number Outstanding (in shares) | shares 4,404,002
Weighted Average Remaining Contractual Life 5 years 277 days
Weighted Average Exercise Price (in dollars per share) $ 2.18
Number Exercisable (in shares) | shares 2,811,617
Weighted Average Exercise Price (in dollars per share) $ 2.30