Note 13 - Activity of Business Segments - Consolidated Net Property and Equipment, Goodwill and Intangible Assets (Details) - USD ($)	Dec. 31, 2022	Dec. 31, 2021
Building Supply	$ 5,798,000	$ 6,122,000
Operating Segments [Member]
Building Supply	4,722,000	5,019,000
Operating Segments [Member] | Building Supply [Member]
Building Supply	3,395,000	3,600,000
Operating Segments [Member] | Disposable Protective Apparel [Member]
Building Supply	1,327,000	1,419,000
Corporate, Non-Segment [Member]
Building Supply	$ 1,076,000	$ 1,103,000