CONSOLIDATED CONDENSED STATEMENTS OF SHAREHOLDERS' EQUITY (DEFICIT) - USD ($)	Common Stock	Retained Earnings (Accumulated Deficit).	Total
BALANCE at Dec. 28, 2019	$ 11,929,300	$ 519,000	$ 12,448,300
BALANCE (in shares) at Dec. 28, 2019	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	$ 145,900		145,900
Stock options exercised (in shares)	2,895
Compensation expense relating to stock options	$ 140,300		140,300
Cash dividends		(912,200)	(912,200)
Comprehensive income (Net income)		7,317,000	7,317,000
BALANCE at Mar. 28, 2020		(29,848,200)	(29,848,200)
BALANCE (in shares) at Mar. 28, 2020	3,650,753
Shareholders' Equity (Deficit)
Stock options exercised	$ 6,013,600		6,013,600
Stock options exercised (in shares)	72,434
Compensation expense relating to stock options	$ 397,700		397,700
Cash dividends		(184,500)	(184,500)
Comprehensive income (Net income)		5,055,200	5,055,200
BALANCE at Jun. 27, 2020	$ 6,411,300	(24,977,500)	(18,566,200)
BALANCE (in shares) at Jun. 27, 2020	3,723,187
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
Shareholders' Equity (Deficit)
Repurchase of common stock	$ (9,935,800)	(519,400)	$ (10,455,200)
Repurchase of common stock (in shares)	(58,255)
Stock options exercised	$ 268,800		268,800
Stock options exercised (in shares)	2,950
Compensation expense relating to stock options	$ 385,200		385,200
Cash dividends		(935,400)	(935,400)
Comprehensive income (Net income)		9,311,100	9,311,100
BALANCE at Mar. 27, 2021		(12,804,200)	(12,804,200)
BALANCE (in shares) at Mar. 27, 2021	3,700,723
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
BALANCE at Jun. 26, 2021		(12,740,500)	$ (12,740,500)
BALANCE (in shares) at Jun. 26, 2021	3,668,019		3,668,019
BALANCE at Mar. 27, 2021		(12,804,200)	$ (12,804,200)
BALANCE (in shares) at Mar. 27, 2021	3,700,723
Shareholders' Equity (Deficit)
Repurchase of common stock	$ (1,254,400)	(7,208,600)	(8,463,000)
Repurchase of common stock (in shares)	(43,833)
Stock options exercised	$ 941,500		941,500
Stock options exercised (in shares)	11,129
Compensation expense relating to stock options	$ 312,900		312,900
Cash dividends		(1,665,000)	(1,665,000)
Comprehensive income (Net income)		8,937,300	8,937,300
BALANCE at Jun. 26, 2021		$ (12,740,500)	$ (12,740,500)
BALANCE (in shares) at Jun. 26, 2021	3,668,019		3,668,019