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Note 6 - Preferred Stock (Details Textual)
Mar. 18, 2009
$ / shares
shares
Sep. 30, 2017
$ / shares
Dec. 31, 2016
$ / shares
Preferred Stock Dividends Number of Preferred Share Purchase Rights Distributed for each Share of Common Stock Outstanding 1    
Common Stock, Par or Stated Value Per Share $ 0.01 $ 0.01 $ 0.01
Preferred Stock, Par or Stated Value Per Share   $ 0.01 $ 0.01
Preferred Share Purchase Right [Member]      
Class of Warrant or Right, Exercise Price of Warrants or Rights $ 25    
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right | shares 0.001    
Series A Junior Participating Preferred Stock [Member]      
Preferred Stock, Par or Stated Value Per Share $ 0.01