Note 10 - Activity of Business Segments - Consolidated Net Sales (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Net sales	$ 16,053,000	$ 14,722,000	$ 45,967,000	$ 49,756,000
Operating Segments [Member] | Building Supply [Member]
Net sales	11,449,000	9,604,000	30,616,000	30,657,000
Operating Segments [Member] | Disposable Protective Apparel [Member]
Net sales	$ 4,604,000	$ 5,118,000	$ 15,351,000	$ 19,099,000