Note 9 - Activity of Business Segments - Reconciliation of Total Segment Income to Total Consolidated Net Income (Details) - USD ($)	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Net income loss	$ 552,000	$ 1,522,000
Provision for income taxes	141,000	452,000
Operating Segments [Member]
Net income loss	1,740,000	3,368,000
Operating Segments [Member] | Building Supply [Member]
Net income loss	956,000	1,667,000
Operating Segments [Member] | Disposable Protective Apparel [Member]
Net income loss	784,000	1,701,000
Corporate, Non-Segment [Member]
Net income loss	$ 1,047,000	$ 1,394,000