Note 14 - Activity of Business Segments - Reconciliation of Total Segment Income to Total Consolidated Net Income (Details) - USD ($)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Income	$ 3,929,000	$ 4,189,000
Provision for income taxes	1,091,000	1,236,000
Operating Segments [Member]
Income	10,227,000	10,088,000
Operating Segments [Member] | Building Supply [Member]
Income	5,746,000	5,703,000
Operating Segments [Member] | Disposable Protective Apparel [Member]
Income	4,481,000	4,385,000
Segment Reporting, Reconciling Item, Corporate Nonsegment [Member]
Income	$ 5,207,000	$ 4,663,000