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Consolidated Balance Sheets [Parenthetical] - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Allowance for doubtful accounts receivable (in dollars) $ 517 $ 578
Preferred stock, par value (in dollars per share) $ 1 $ 1
Preferred stock, shares authorized 1,000,000 1,000,000
Preferred stock, shares issued 0 0
Common stock, par value (in dollars per share) $ 0.10 $ 0.10
Common stock, shares authorized 25,000,000 25,000,000
Common stock, shares outstanding 12,449,253 12,266,407
Treasury stock, shares 619,667 619,667
Class B Convertible Common Stock    
Common stock, par value (in dollars per share) $ 0.10 $ 0.10
Common stock, shares authorized 3,000,000 3,000,000
Common stock, shares outstanding 1,025,158 1,025,158