Note 10 - Activity of Business Segments - Consolidated Net Property and Equipment, Goodwill and Intangible Assets (Details) - USD ($)	Jun. 30, 2023	Dec. 31, 2022
Assets	$ 5,726,000	$ 5,798,000
Operating Segments [Member]
Assets	4,689,000	4,722,000
Operating Segments [Member] | Building Supply [Member]
Assets	3,420,000	3,395,000
Operating Segments [Member] | Disposable Protective Apparel [Member]
Assets	1,269,000	1,327,000
Corporate, Non-Segment [Member]
Assets	$ 1,037,000	$ 1,076,000