Quarterly report pursuant to Section 13 or 15(d)

Condensed Consolidated Balance Sheets (Parenthetical)

v3.5.0.2
Condensed Consolidated Balance Sheets (Parenthetical) - USD ($)
Sep. 30, 2016
Dec. 31, 2015
Statement of Financial Position [Abstract]    
Allowance for Doubtful Accounts Receivable, Current $ 179,000 $ 247,000
Assets    
Accumulated depreciation $ 44,306,220 $ 50,203,945
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) 1,641,639 1,663,314
Intangible asset, net of accumulated amortization $ 7,538,915 $ 5,711,175
Unamortized debt issuance costs $ 0 $ 135,915