Note 9 - Activity of Business Segments - Consolidated Net Property and Equipment, Goodwill and Intangible Assets (Details) - USD ($)	Mar. 31, 2022	Dec. 31, 2021
Consolidated assets	$ 6,043,000	$ 6,122,000
Operating Segments [Member]
Consolidated assets	4,950,000	5,019,000
Operating Segments [Member] | Building Supply [Member]
Consolidated assets	3,556,000	3,600,000
Operating Segments [Member] | Disposable Protective Apparel [Member]
Consolidated assets	1,394,000	1,419,000
Corporate, Non-Segment [Member]
Consolidated assets	$ 1,093,000	$ 1,103,000