Note 15 - Activity of Business Segments - Consolidated Net Property and Equipment, Goodwill and Intangible Assets (Details) - USD ($)	Dec. 31, 2023	Dec. 31, 2022
Consolidated assets	$ 5,642,000	$ 5,798,000
Operating Segments [Member]
Consolidated assets	4,602,000	4,722,000
Operating Segments [Member] | Building Supply [Member]
Consolidated assets	3,389,000	3,395,000
Operating Segments [Member] | Disposable Protective Apparel [Member]
Consolidated assets	1,213,000	1,327,000
Corporate, Non-Segment [Member]
Consolidated assets	$ 1,040,000	$ 1,076,000