Note 15 - Activity of Business Segments - Consolidated Net Sales (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Net sales	$ 102,700,000	$ 46,665,000
Building Supply [Member] | Operating Segments [Member]
Net sales	30,580,000	26,576,000
Disposable Protective Apparel [Member] | Operating Segments [Member]
Net sales	$ 72,120,000	$ 20,089,000