Note 10 - Activity of Business Segments - Consolidated Net Property and Equipment, Goodwill and Intangible Assets (Details) - USD ($)	Mar. 31, 2024	Dec. 31, 2023
Assets	$ 5,481,000	$ 5,642,000
Operating Segments [Member]
Assets	4,457,000	4,602,000
Operating Segments [Member] | Building Supply [Member]
Assets	3,273,000	3,389,000
Operating Segments [Member] | Disposable Protective Apparel [Member]
Assets	1,184,000	1,213,000
Segment Reporting, Reconciling Item, Corporate Nonsegment [Member]
Assets	$ 1,024,000	$ 1,040,000