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Consolidated Balance Sheets (Parenthetical) - $ / shares
Dec. 31, 2015
Dec. 31, 2014
Statement of Financial Position [Abstract]    
Common stock, no par value (dollars per share) $ 0 $ 0
Common stock, number of shares authorized 100,000,000 100,000,000
Common stock, number of shares issued 16,379,501 17,118,993
Common stock, number of shares outstanding 16,379,501 17,118,993