Note 10 - Activity of Business Segments - Consolidated Net Sales (Details) - USD ($)	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Net sales	$ 13,800,000	$ 17,661,000
Operating Segments [Member] | Building Supply [Member]
Net sales	8,631,000	10,237,000
Operating Segments [Member] | Disposable Protective Apparel [Member]
Net sales	$ 5,169,000	$ 7,424,000