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Note 14 - Net Income Per Share - Basic and Diluted Earnings Per Share (Details) - USD ($)
 12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Equity Option [Member]    
Potentially dilutive securities outstanding at period end excluded from the diluted computation as the inclusion would have been antidilutive:    
Potentially dilutive securities (in shares) 4,404,002 1,402,750
Warrant [Member]    
Potentially dilutive securities outstanding at period end excluded from the diluted computation as the inclusion would have been antidilutive:    
Potentially dilutive securities (in shares) 1,627,945
(Loss) income available to common stockholders $ (1,281,599) $ 9,687,816
Weighted average common shares outstanding (in shares) 31,970,600 33,174,546
Assumed exercise of dilutive options and warrants (in shares) 400,373
Weighted average dilutive shares outstanding (in shares) 31,970,600 33,574,919
Basic (loss) income per common share (in dollars per share) $ (0.04) $ 0.29
Diluted (loss) income per common share (in dollars per share) $ (0.04) $ 0.29
Potentially dilutive securities (in shares) 4,404,002 3,030,695