Note 10 - Activity of Business Segments - Consolidated Net Property and Equipment, Goodwill and Intangible Assets (Details) - USD ($)	Mar. 31, 2023	Dec. 31, 2022
Consolidated assets	$ 5,844,000	$ 5,798,000
Operating Segments [Member]
Consolidated assets	4,784,000	4,722,000
Operating Segments [Member] | Building Supply [Member]
Consolidated assets	3,486,000	3,395,000
Operating Segments [Member] | Disposable Protective Apparel [Member]
Consolidated assets	1,298,000	1,327,000
Corporate, Non-Segment [Member]
Consolidated assets	$ 1,060,000	$ 1,076,000