Note 13 - Activity of Business Segments - Consolidated Net Sales (Details) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Net sales	$ 61,981,000	$ 68,637,000
Operating Segments [Member] | Building Supply [Member]
Net sales	36,937,000	36,889,000
Operating Segments [Member] | Disposable Protective Apparel [Member]
Net sales	$ 25,044,000	$ 31,748,000