Annual report pursuant to Section 13 and 15(d)

Consolidated Balance Sheets (Parenthetical)

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Consolidated Balance Sheets (Parenthetical) - USD ($)
Dec. 31, 2018
Dec. 31, 2017
Current assets    
Accounts receivable, allowance for doubtful accounts $ 169,107 $ 35,000
Liabilities and Shareholders' Equity    
Common stock, par value (in dollars per share) $ 1 $ 1
Common stock, shares authorized (in shares) 24,000,000 24,000,000
Common stock, shares issued (in shares) 10,300,000 10,300,000
Common stock in treasury, at cost (in shares) 1,424,279 1,566,769