Note 9 - Activity of Business Segments - Consolidated Net Sales (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Net sales	$ 14,722,000	$ 14,475,000	$ 49,756,000	$ 55,442,000
Operating Segments [Member] | Building Supply [Member]
Net sales	9,604,000	10,072,000	30,657,000	28,210,000
Operating Segments [Member] | Disposable Protective Apparel [Member]
Net sales	$ 5,118,000	$ 4,403,000	$ 19,099,000	$ 27,232,000