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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, 2017
Mar. 31, 2016
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Stock Repurchased and Retired During Period, Shares         0 1,099,608  
Stock Repurchased During Period, Value           $ 1,748,456  
Common Stock, Dividends, Per Share, Declared $ 0.01 $ 0.01 $ 0.01 $ 0 $ 0.02  
Dividends, Common Stock       $ 317,988   $ 636,661  
Share Buyback Program [Member]              
Stock Repurchase Program, Authorized Amount             $ 4,000,000