CONSOLIDATED CONDENSED STATEMENTS OF SHAREHOLDERS' EQUITY (DEFICIT) - USD ($)	Common Stock	Retained Earnings (Accumulated Deficit).	Total
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	$ 156,600		156,600
Stock options exercised (in shares)	1,500
Compensation expense relating to stock options	$ 498,800		498,800
Cash dividends		(586,100)	(586,100)
Comprehensive income (Net income)		7,272,200	7,272,200
BALANCE at Mar. 30, 2019		(21,495,100)	(21,495,100)
BALANCE (in shares) at Mar. 30, 2019	3,759,186
Shareholders' Equity (Deficit)
Stock options exercised	$ 788,800		788,800
Stock options exercised (in shares)	22,153
Compensation expense relating to stock options	$ 516,800		516,800
Cash dividends		(942,800)	(942,800)
Comprehensive income (Net income)		7,301,900	7,301,900
BALANCE at Jun. 29, 2019	$ 1,305,600	(15,136,000)	(13,830,400)
BALANCE (in shares) at Jun. 29, 2019	3,781,339
Shareholders' Equity (Deficit)
Stock options exercised	$ 2,049,600		2,049,600
Stock options exercised (in shares)	41,639
Compensation expense relating to stock options	$ 495,800		495,800
Cash dividends		(954,800)	(954,800)
Comprehensive income (Net income)		9,113,800	9,113,800
BALANCE at Sep. 28, 2019	$ 3,851,000	(6,977,000)	(3,126,000)
BALANCE (in shares) at Sep. 28, 2019	3,822,978
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	$ 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
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
BALANCE at Sep. 26, 2020	$ 7,717,800	(16,551,500)	$ (8,833,700)
BALANCE (in shares) at Sep. 26, 2020	3,735,437		3,735,437
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
Shareholders' Equity (Deficit)
Stock options exercised	$ 914,600		914,600
Stock options exercised (in shares)	12,250
Compensation expense relating to stock options	$ 391,900		391,900
Cash dividends		(932,800)	(932,800)
Comprehensive income (Net income)		9,358,800	9,358,800
BALANCE at Sep. 26, 2020	$ 7,717,800	$ (16,551,500)	$ (8,833,700)
BALANCE (in shares) at Sep. 26, 2020	3,735,437		3,735,437