CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (DEFICIT) - USD ($)	Common Stock	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Total
BALANCE at Dec. 28, 2013	$ 2,949,500	$ 35,199,300	$ (4,100)	$ 38,144,700
BALANCE (in shares) at Dec. 28, 2013	5,143,530
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Repurchase of common stock	$ (4,453,400)	(7,111,400)		(11,564,800)
Repurchase of common stock (in shares)	(166,030)
Stock options exercised and related tax benefits	$ 509,100			509,100
Stock options exercised and related tax benefits (in shares)	21,012
Compensation expense relating to stock options	$ 1,417,200			1,417,200
Cash dividends		(26,930,200)		(26,930,200)
Comprehensive income (loss)		20,066,500	(33,000)	20,033,500
BALANCE at Dec. 27, 2014	$ 422,400	21,224,200	(37,100)	21,609,500
BALANCE (in shares) at Dec. 27, 2014	4,998,512
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Repurchase of common stock	$ (2,010,600)	(72,843,100)		(74,853,700)
Repurchase of common stock (in shares)	(881,518)
Stock options exercised and related tax benefits	$ 299,900			299,900
Stock options exercised and related tax benefits (in shares)	7,773
Compensation expense relating to stock options	$ 1,694,800			1,694,800
Cash dividends		(1,228,200)		(1,228,200)
Comprehensive income (loss)		21,799,700	4,200	21,803,900
BALANCE at Dec. 26, 2015	$ 406,500	(31,047,400)	(32,900)	$ (30,673,800)
BALANCE (in shares) at Dec. 26, 2015	4,124,767			4,124,767
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Repurchase of common stock	$ (1,112,300)	(461,600)		$ (1,573,900)
Repurchase of common stock (in shares)	(17,194)
Stock options exercised and related tax benefits	$ 1,905,300			1,905,300
Stock options exercised and related tax benefits (in shares)	58,196
Compensation expense relating to stock options	$ 1,776,600			1,776,600
Cash dividends		(1,526,800)		(1,526,800)
Comprehensive income (loss)		22,217,600	23,000	22,240,600
BALANCE at Dec. 31, 2016	$ 2,976,100	$ (10,818,200)	$ (9,900)	$ (7,852,000)
BALANCE (in shares) at Dec. 31, 2016	4,165,769			4,165,769