Note 15 - Activity of Business Segments - Reconciliation of Total Segment Income to Total Consolidated Net Income (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Consolidated net income	$ 6,756,000	$ 26,888,000
Income Tax Expense (Benefit), Total	1,744,000	5,360,000
Operating Segments [Member]
Consolidated net income	14,056,000	38,897,000
Operating Segments [Member] | Building Supply [Member]
Consolidated net income	7,350,000	5,396,000
Operating Segments [Member] | Disposable Protective Apparel [Member]
Consolidated net income	6,706,000	33,501,000
Corporate, Non-Segment [Member]
Consolidated net income	$ 5,556,000	$ 6,649,000