Condensed Statements of Stockholders' Equity (Unaudited) - USD ($)	Common Stock Outstanding [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Treasury Stock, Common [Member]	Total
Balance (in shares) at Dec. 31, 2023	4,634,865
Balance at Dec. 31, 2023	$ 4,635	$ 2,346,483	$ 7,771,655	$ (223,208)	$ 9,899,565
Stock compensation expense (in shares)	0
Stock compensation expense	$ 0	25,223	0	0	25,223
Cash dividends declared	0	0	(46,347)	0	(46,347)
Net income	$ 0	0	11,661	0	11,661
Balance (in shares) at Mar. 31, 2024	4,634,865
Balance at Mar. 31, 2024	$ 4,635	2,371,706	7,736,969	(223,208)	9,890,102
Balance (in shares) at Dec. 31, 2023	4,634,865
Balance at Dec. 31, 2023	$ 4,635	2,346,483	7,771,655	(223,208)	9,899,565
Net income					$ 1,110,610
Exercise of employee stock options (in shares)					(0)
Balance (in shares) at Sep. 30, 2024	4,635,568
Balance at Sep. 30, 2024	$ 4,636	2,418,333	8,789,569	(222,435)	$ 10,990,103
Balance (in shares) at Mar. 31, 2024	4,634,865
Balance at Mar. 31, 2024	$ 4,635	2,371,706	7,736,969	(223,208)	9,890,102
Stock compensation expense (in shares)	0
Stock compensation expense	$ 0	25,224	0	0	25,224
Net income	$ 0	0	806,570	0	806,570
Balance (in shares) at Jun. 30, 2024	4,634,865
Balance at Jun. 30, 2024	$ 4,635	2,396,930	8,543,539	(223,208)	10,721,896
Stock compensation expense (in shares)	0
Stock compensation expense	$ 0	19,477	0	0	19,477
Cash dividends declared	0	0	(46,349)	0	(46,349)
Net income	$ 0	0	292,379	0	292,379
Stock issued for service from treasury (in shares)	703
Stock issued for service from treasury	$ 1	1,926	0	773	2,700
Balance (in shares) at Sep. 30, 2024	4,635,568
Balance at Sep. 30, 2024	$ 4,636	2,418,333	8,789,569	(222,435)	10,990,103
Balance (in shares) at Dec. 31, 2024	4,635,568
Balance at Dec. 31, 2024	$ 4,636	2,470,850	9,209,030	(222,435)	11,462,081
Stock compensation expense (in shares)	0
Stock compensation expense	$ 0	19,477	0	0	19,477
Cash dividends declared	0	0	(92,789)	0	(92,789)
Net income	$ 0	0	782,239	0	782,239
Stock issued for service from treasury (in shares)	3,955
Stock issued for service from treasury	$ 4	10,001	0	3,955	13,960
Balance (in shares) at Mar. 31, 2025	4,639,523
Balance at Mar. 31, 2025	$ 4,640	2,500,328	9,898,480	(218,480)	12,184,968
Balance (in shares) at Dec. 31, 2024	4,635,568
Balance at Dec. 31, 2024	$ 4,636	2,470,850	9,209,030	(222,435)	11,462,081
Net income					$ 985,374
Exercise of employee stock options (in shares)					2,000
Balance (in shares) at Sep. 30, 2025	4,641,523
Balance at Sep. 30, 2025	$ 4,642	2,545,003	9,915,995	(216,343)	$ 12,249,297
Balance (in shares) at Mar. 31, 2025	4,639,523
Balance at Mar. 31, 2025	$ 4,640	2,500,328	9,898,480	(218,480)	12,184,968
Stock compensation expense	0	19,477	0	0	19,477
Cash dividends declared	0	0	(92,790)	0	(92,790)
Net income	$ 0	0	144,782	0	144,782
Balance (in shares) at Jun. 30, 2025	4,639,523
Balance at Jun. 30, 2025	$ 4,640	2,519,805	9,950,473	(218,480)	12,256,438
Stock compensation expense	0	19,477	0	0	19,477
Cash dividends declared	0	0	(92,830)	0	(92,830)
Net income	$ 0	0	58,352	0	58,352
Exercise of employee stock options (in shares)	2,000
Exercise of employee stock options	$ 2	5,721	0	2,137	7,860
Balance (in shares) at Sep. 30, 2025	4,641,523
Balance at Sep. 30, 2025	$ 4,642	$ 2,545,003	$ 9,915,995	$ (216,343)	$ 12,249,297