Note 15 - Activity of Business Segments - Consolidated Net Sales (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Net sales	$ 68,637,000	$ 102,700,000
Building Supply [Member] | Operating Segments [Member]
Net sales	36,889,000	30,580,000
Disposable Protective Apparel [Member] | Operating Segments [Member]
Net sales	$ 31,748,000	$ 72,120,000