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Note 11 - Stockholders' Equity (Details Textual) - USD ($)
 3 Months Ended 6 Months Ended
Feb. 04, 2016
Dec. 03, 2015
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2016
Mar. 31, 2015
Share Buyback Program [Member]            
Stock Repurchase Program, Authorized Amount     $ 4,000,000   $ 4,000,000  
New Share Buyback Program [Member]            
Stock Repurchase Program, Authorized Amount     $ 4,000,000   $ 4,000,000  
Class of Warrant or Right, Number of Securities Called by Warrants or Rights     1,627,945   1,627,945  
Class of Warrant or Right, Exercise Price of Warrants or Rights     $ 2.67   $ 2.67  
Stock Repurchased and Retired During Period, Shares         1,099,608  
Stock Repurchased During Period, Value         $ 1,748,456  
Common Stock, Dividends, Per Share, Declared $ 0.01 $ 0.01 $ 0.01 $ 0.02
Dividends, Common Stock     $ 317,988 $ 0 $ 636,661 $ 0
Class of Warrant or Right, Outstanding     0   0