Quarterly report pursuant to Section 13 or 15(d)

Condensed Consolidated Balance Sheets (Parenthetical)

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Condensed Consolidated Balance Sheets (Parenthetical) (USD $)
Jun. 29, 2013
Dec. 29, 2012
Statement of Financial Position [Abstract]    
Allowance for Doubtful Accounts Receivable, Current $ 1,277,191 $ 1,312,715
Assets    
Accumulated depreciation $ 42,467,203 $ 40,966,957
Shareholders' equity    
Common stock, par value (in dollars per share) $ 1 $ 1
Common stock, shares authorized (in shares) 12,000,000 12,000,000
Common stock, shares issued (in shares) 8,000,000 8,000,000
Common stock in treasury, at cost (in shares) 1,617,200 1,643,267