Note 15 - Activity of Business Segments - Consolidated Net Sale (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Net sales	$ 61,232,000	$ 61,981,000
Operating Segments [Member] | Building Supply [Member]
Net sales	40,396,000	36,937,000
Operating Segments [Member] | Disposable Protective Apparel [Member]
Net sales	$ 20,836,000	$ 25,044,000