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Consolidated Statements of Changes in Shareholders' Equity (Parentheticals) - $ / shares
Mar. 31, 2017
Dec. 31, 2016
Mar. 31, 2016
Dec. 31, 2015
Warrant [Member]        
Warrants, exercise price per share (in dollars per share)   $ 6 $ 6 $ 6
Common Stock [Member]        
Common stock, price per share (in dollars per share) $ 7 7    
Warrants, exercise price per share (in dollars per share)   $ 6 $ 6