Note 9 - Activity of Business Segments - Consolidated Net Sales (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Net sales	$ 17,373,000	$ 17,806,000	$ 35,034,000	$ 40,967,000
Operating Segments [Member] | Building Supply [Member]
Net sales	10,817,000	9,798,000	21,054,000	18,138,000
Operating Segments [Member] | Disposable Protective Apparel [Member]
Net sales	$ 6,556,000	$ 8,008,000	$ 13,980,000	$ 22,829,000