Note 14 - Activity of Business Segments - Reconciliation of Total Segment Income to Total Consolidated Net Income (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Consolidated net income	$ 3,168,000	$ 1,041,000
Provision for income taxes	1,007,000	480,000
Operating Segments [Member]
Consolidated net income	8,597,000	6,440,000
Operating Segments [Member] | Building Supply [Member]
Consolidated net income	5,345,000	3,605,000
Operating Segments [Member] | Disposable Protective Apparel [Member]
Consolidated net income	1,671,000	1,439,000
Operating Segments [Member] | Infection Control [Member]
Consolidated net income	1,581,000	1,396,000
Corporate, Non-Segment [Member]
Consolidated net income	$ 4,422,000	$ 4,919,000