Statements of Stockholders' Equity (Unaudited) - USD ($)	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Treasury Stock [Member]	Total
Balance (in shares) at Dec. 28, 2019	13,427,492
Balance at Dec. 28, 2019	$ 134,275	$ 36,094,201	$ (30,380,433)	$ (517,053)	$ 5,330,990
Share-based compensation expense		100,452			100,452
Issuance of common stock (in shares)	500
Issuance of common stock	$ 5	763			768
Employee option exercises (in shares)	288,250
Employee option exercises	$ 2,882	438,140		(441,022)
Net income			1,131,901		1,131,901
Balance (in shares) at Sep. 26, 2020	13,716,242
Balance at Sep. 26, 2020	$ 137,162	36,633,556	(29,248,532)	(958,075)	6,564,111
Balance (in shares) at Jun. 26, 2020	13,427,492
Balance at Jun. 26, 2020	$ 134,275	36,177,264	(29,479,548)	(517,053)	6,314,938
Share-based compensation expense		17,389			17,389
Issuance of common stock (in shares)	500
Issuance of common stock	$ 5	763			768
Employee option exercises (in shares)	288,250
Employee option exercises	$ 2,882	438,140	0	(441,022)
Net income			231,016		231,016
Balance (in shares) at Sep. 26, 2020	13,716,242
Balance at Sep. 26, 2020	$ 137,162	36,633,556	(29,248,532)	(958,075)	$ 6,564,111
Balance (in shares) at Dec. 26, 2020	13,746,242				13,746,242
Balance at Dec. 26, 2020	$ 137,462	36,688,894	(29,472,368)	(996,323)	$ 6,357,665
Share-based compensation expense		147,652			147,652
Issuance of common stock (in shares)	526,804
Issuance of common stock	$ 5,268	3,417,102			3,422,370
Employee option exercises (in shares)	630,400
Employee option exercises	$ 6,304	1,235,370		(1,230,445)	11,229
Net income			2,998,067		$ 2,998,067
Treasury shares retired (in shares)	(554,660)
Treasury shares retired	$ (5,547)	(2,218,706)		2,224,253
Balance (in shares) at Sep. 25, 2021	14,348,786				14,348,786
Balance at Sep. 25, 2021	$ 143,487	39,270,312	(26,474,301)	(2,515)	$ 12,936,983
Balance (in shares) at Jun. 26, 2021	14,300,771
Balance at Jun. 26, 2021	$ 143,007	38,956,952	(29,202,268)	(1,770)	9,895,921
Share-based compensation expense		28,117			28,117
Issuance of common stock (in shares)	47,515
Issuance of common stock	$ 475	284,503			$ 284,978
Employee option exercises (in shares)	500				500
Employee option exercises	$ 5	740		(745)
Net income			2,727,967		$ 2,727,967
Balance (in shares) at Sep. 25, 2021	14,348,786				14,348,786
Balance at Sep. 25, 2021	$ 143,487	$ 39,270,312	$ (26,474,301)	$ (2,515)	$ 12,936,983