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Note 12 - Share-based Compensation - Stock Option Activity (Details) - $ / shares
 12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Number of Shares Outstanding, Beginning Balance (in shares) 4,404,002  
Weighted Average Exercise Price, Shares Outstanding, Beginning Balance (in dollars per share) $ 2.18  
Number of Shares Granted (in shares) 574,500  
Weighted Average Exercise Price, Shares Granted (in dollars per share) $ 2.09  
Number of Shares Forfeited/expired (in shares) (81,667)  
Weighted Average Exercise Price, Shares Forfeited/expired (in dollars per share) $ 2.51  
Number of Shares Exercised (in shares) (233,333) (1,250)
Weighted Average Exercise Price, Exercised (in dollars per share) $ 1.60  
Number of Shares Outstanding, Ending Balance (in shares) 4,663,502 4,404,002
Weighted Average Exercise Price, Shares Outstanding, Ending Balance (in dollars per share) $ 2.16 $ 2.18
Number of Shares Exercisable (in shares) 3,329,437  
Weighted Average Exercise Price, Shares Exercisable (in dollars per share) $ 2.25