CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (DEFICIT) - USD ($)	Common Stock	Retained Earnings (Accumulated Deficit).	Total
BALANCE at Dec. 30, 2017	$ 1,476,200	$ (37,189,700)	$ (35,713,500)
BALANCE (in shares) at Dec. 30, 2017	3,843,078
Shareholders' Equity (Deficit)
Repurchase of common stock	$ (1,846,400)		(1,846,400)
Repurchase of common stock (in shares)	(12,384)
Stock options exercised	$ 2,819,700		2,819,700
Stock options exercised (in shares)	76,992
Compensation expense relating to stock options	$ 1,976,100		1,976,100
Cash dividends		(2,169,900)	(2,169,900)
Comprehensive income (Net income)		30,125,500	30,125,500
BALANCE at Dec. 29, 2018	$ 4,425,600	(9,234,100)	(4,808,500)
BALANCE (in shares) at Dec. 29, 2018	3,907,686
Shareholders' Equity (Deficit)
Repurchase of common stock	$ (5,081,000)	(18,947,100)	(24,028,100)
Repurchase of common stock (in shares)	(150,000)
Stock options exercised	$ 10,918,300		10,918,300
Stock options exercised (in shares)	190,172
Compensation expense relating to stock options	$ 1,666,400		1,666,400
Cash dividends		(3,449,100)	(3,449,100)
Comprehensive income (Net income)		32,149,300	32,149,300
BALANCE at Dec. 28, 2019	$ 11,929,300	519,000	$ 12,448,300
BALANCE (in shares) at Dec. 28, 2019	3,947,858		3,947,858
Shareholders' Equity (Deficit)
Repurchase of common stock	$ (12,215,500)	(36,772,000)	$ (48,987,500)
Repurchase of common stock (in shares)	(300,000)
Stock options exercised	$ 8,252,800		8,252,800
Stock options exercised (in shares)	108,170
Compensation expense relating to stock options	$ 1,315,200		1,315,200
Cash dividends		(14,230,800)	(14,230,800)
Comprehensive income (Net income)		29,823,300	29,823,300
BALANCE at Dec. 26, 2020	$ 9,281,800	$ (20,660,500)	$ (11,378,700)
BALANCE (in shares) at Dec. 26, 2020	3,756,028		3,756,028