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Consolidated Balance Sheets (Parenthetical) - $ / shares
Dec. 31, 2016
Dec. 31, 2015
Stockholders' equity:    
Common stock, par value $ 0.1 $ 0.1
Common stock, shares authorized 20,000,000 20,000,000
Common stock, shares issued 11,462,484 11,392,236
Treasury stock, shares 42,600 42,600