Note 14 - Activity of Business Segments - Reconciliation of Total Segment Income to Total Consolidated Net Income (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Consolidated net income	$ 3,625,000	$ 2,633,000
Provision for income taxes	789,000	1,037,000
Operating Segments [Member]
Consolidated net income	8,420,000	8,503,000
Operating Segments [Member] | Building Supply [Member]
Consolidated net income	3,836,000	4,143,000
Operating Segments [Member] | Disposable Protective Apparel [Member]
Consolidated net income	2,862,000	2,516,000
Operating Segments [Member] | Infection Control [Member]
Consolidated net income	1,722,000	1,844,000
Corporate, Non-Segment [Member]
Consolidated net income	$ 4,006,000	$ 4,833,000