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Note 12 - Share-based Compensation - Stock Option Activity (Details) - $ / shares
 12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Number of Shares Outstanding, Beginning Balance (in shares) 2,852,419  
Weighted Average Exercise Price, Shares Outstanding, Beginning Balance (in dollars per share) $ 2.35  
Number of Shares Granted (in shares) 1,857,000  
Weighted Average Exercise Price, Shares Granted (in dollars per share) $ 1.93  
Number of Shares Forfeited/expired (in shares) (304,167)  
Weighted Average Exercise Price, Shares Forfeited/expired (in dollars per share) $ 2.18  
Exercised (in shares) (1,250) (396,042)
Exercised (in dollars per share) $ 1.76  
Number of Shares Outstanding, Ending Balance (in shares) 4,404,002 2,852,419
Weighted Average Exercise Price, Shares Outstanding, Ending Balance (in dollars per share) $ 2.18 $ 2.35
Number of Shares Exercisable (in shares) 2,811,617  
Weighted Average Exercise Price, Shares Exercisable (in dollars per share) $ 2.30