Note 15 - Activity of Business Segments - Reconciliation of Total Segment Income to Total Consolidated Net Income (Details) - USD ($)	3 Months Ended						12 Months Ended
	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2023	Dec. 31, 2022
Income	$ 1,430,000	$ 1,146,000	$ 552,000	$ 503,000	$ 693,000	$ 1,522,000	$ 4,189,000	$ 3,282,000
Provision for income taxes							1,236,000	1,113,000
Operating Segments [Member]
Income							10,088,000	9,369,000
Operating Segments [Member] | Building Supply [Member]
Income							5,703,000	5,359,000
Operating Segments [Member] | Disposable Protective Apparel [Member]
Income							4,385,000	4,010,000
Corporate, Non-Segment [Member]
Income							$ 4,663,000	$ 4,974,000