CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (DEFICIT) - USD ($)	Common Stock	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Total
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
Shareholders’ Equity (Deficit)
Repurchase of common stock	$ (2,010,600)	(72,843,100)		(74,853,700)
Repurchase of common stock (in shares)	(881,518)
Stock options exercised	$ 299,900			299,900
Stock options exercised (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		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
Shareholders’ Equity (Deficit)
Repurchase of common stock	$ (1,112,300)	(461,600)		(1,573,900)
Repurchase of common stock (in shares)	(17,194)
Stock options exercised	$ 1,905,300			1,905,300
Stock options exercised (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		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
Shareholders’ Equity (Deficit)
Repurchase of common stock	$ (5,766,200)	(44,136,300)		$ (49,902,500)
Repurchase of common stock (in shares)	(400,000)
Stock options exercised	$ 2,309,700			2,309,700
Stock options exercised (in shares)	77,309
Compensation expense relating to stock options	$ 1,956,600			1,956,600
Cash dividends		(1,765,000)		(1,765,000)
Comprehensive income		24,565,100	$ 9,900	24,575,000
BALANCE at Dec. 30, 2017	$ 1,476,200	$ (32,154,400)		$ (30,678,200)
BALANCE (in shares) at Dec. 30, 2017	3,843,078			3,843,078