Note 10 - Activity of Business Segments - Consolidated Net Sales (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Net sales	$ 16,115,000	$ 17,373,000	$ 29,914,000	$ 35,034,000
Operating Segments [Member] | Building Supply [Member]
Net sales	10,537,000	10,817,000	19,167,000	21,054,000
Operating Segments [Member] | Disposable Protective Apparel [Member]
Net sales	$ 5,578,000	$ 6,556,000	$ 10,747,000	$ 13,980,000