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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
Dec. 31, 2016
Dec. 31, 2015
CONSOLIDATED BALANCE SHEETS    
Allowance for doubtful accounts $ 250,000 $ 250,000
Preferred stock, par value (in dollars per share) $ 1.00 $ 1.00
Preferred stock, shares authorized 4,000,000 4,000,000
Preferred stock, shares outstanding 0 0
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, shares authorized 35,000,000 35,000,000
Common stock, shares issued 21,704,851 21,629,310
Common stock, shares outstanding 21,656,406 21,580,865
Treasury stock, shares 48,445 48,445