Note 13 - Activity of Business Segments - Reconciliation of Total Segment Income to Total Consolidated Net Income (Details) - USD ($)	3 Months Ended						6 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2022	Jun. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2022	Dec. 31, 2021
Building Supply	$ 503,000	$ 693,000	$ 1,522,000	$ 766,000	$ 1,671,000	$ 3,719,000	$ 2,215,000	$ 5,390,000	$ 2,718,000	$ 6,156,000	$ 3,282,000	$ 6,756,000
Provision for income taxes											1,113,000	1,744,000
Operating Segments [Member]
Building Supply											9,369,000	14,056,000
Operating Segments [Member] | Building Supply [Member]
Building Supply											5,359,000	7,350,000
Operating Segments [Member] | Disposable Protective Apparel [Member]
Building Supply											4,010,000	6,706,000
Corporate, Non-Segment [Member]
Building Supply											$ 4,974,000	$ 5,556,000