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. 26, 2020	13,746,242
Balance at Dec. 26, 2020	$ 137,462	$ 36,688,894	$ (29,472,369)	$ (996,323)	$ 6,357,664
Share-based compensation expense		119,535			119,535
Issuance of common stock	$ (4,793)	(3,132,599)			$ (3,137,392)
Employee option exercises (in shares)	629,900				629,900
Employee option exercises	$ 6,299	1,234,630		(1,229,700)	$ 11,229
Net income (loss)			270,101		270,101
Issuance of common stock (in shares)	479,900
Issuance of common stock	$ 4,793	3,132,599			3,137,392
Treasury shares retired (in shares)	(554,660)
Treasury shares retired	$ (5,547)	(2,218,706)		2,224,253
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
Balance (in shares) at Mar. 27, 2021	14,360,042
Balance at Mar. 27, 2021	$ 143,600	37,925,674	(29,441,466)	(2,201,509)	6,426,299
Share-based compensation expense		92,113			92,113
Issuance of common stock	$ (4,793)	(3,132,599)			$ (3,137,392)
Employee option exercises (in shares)	16,100				16,100
Employee option exercises	$ 161	25,272		(24,514)	$ 919
Net income (loss)			239,198		239,198
Issuance of common stock (in shares)	479,289
Issuance of common stock	$ 4,793	3,132,599			3,137,392
Treasury shares retired (in shares)	(554,660)
Treasury shares retired	$ (5,547)	(2,218,706)		2,224,253
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
Balance (in shares) at Dec. 25, 2021	14,350,786
Balance at Dec. 25, 2021	$ 143,508	39,281,810	(26,256,492)	(2,515)	13,166,311
Share-based compensation expense		163,855			163,855
Issuance of common stock		(17,758)			$ (17,758)
Employee option exercises (in shares)	88,000				88,000
Employee option exercises	$ 880	172,178		(18,334)	$ 154,724
Net income (loss)			874,544		874,544
Issuance of common stock		17,758			17,758
Balance (in shares) at Jul. 02, 2022	14,438,786
Balance at Jul. 02, 2022	$ 144,388	39,600,085	(25,381,948)	(20,849)	14,341,676
Balance (in shares) at Apr. 02, 2022	14,423,486
Balance at Apr. 02, 2022	$ 144,235	39,546,975	(25,837,056)	(5,623)	13,848,531
Share-based compensation expense		39,384			39,384
Issuance of common stock		(8,144)			$ (8,144)
Employee option exercises (in shares)	15,300				15,300
Employee option exercises	$ 153	21,870		(15,226)	$ 6,797
Net income (loss)			455,108		455,108
Issuance of common stock		8,144			8,144
Balance (in shares) at Jul. 02, 2022	14,438,786
Balance at Jul. 02, 2022	$ 144,388	$ 39,600,085	$ (25,381,948)	$ (20,849)	$ 14,341,676