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Consolidated Balance Sheet (Parenthetical) - $ / shares
Sep. 30, 2016
Dec. 31, 2015
Dec. 31, 2014
Common stock, shares authorized (in shares) 10,000,000 10,000,000 10,000,000
Common stock, shares issued (in shares) 2,636,830 2,263,403 2,242,025
Common stock, par value (in dollars per share) $ 0 $ 0 $ 0
Common stock, shares outstanding (in shares) 2,250,665 1,877,238 2,052,495
Treasury stock, shares (in shares) 386,165 386,165 189,530