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Note 13 - Stockholders' Equity (Details Textual) - USD ($)
 12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Share Buyback Program [Member]    
Stock Repurchase Program, Authorized Amount $ 4,000,000  
New Share Buyback Program [Member]    
Stock Repurchase Program, Authorized Amount $ 4,000,000  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period 1,250 396,042
Proceeds from Stock Options Exercised $ 2,200 $ 504,371
Preferred Stock, Shares Authorized 5,000,000 5,000,000
Preferred Stock, Par or Stated Value Per Share $ 0.00001 $ 0.00001
Preferred Stock, Shares Outstanding 0 0
Class of Warrant or Right, Number of Securities Called by Warrants or Rights 1,627,945  
Class of Warrant or Right, Exercise Price of Warrants or Rights $ 2.67  
Stock Repurchased and Retired During Period, Shares 1,099,608 734,070
Stock Repurchased During Period, Value $ 1,748,456 $ 1,564,666