Note 10 - Activity of Business Segements - Reconciliation of Total Segment Income to Total Consolidated Net Income (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Operating Segments [Member] | Building Supply [Member]
Consolidated net income	$ 1,618,000	$ 1,241,000	$ 4,287,000	$ 2,876,000
Operating Segments [Member] | Disposable Protective Apparel [Member]
Consolidated net income	617,000	734,000	1,327,000	1,272,000
Operating Segments [Member] | Infection Control [Member]
Consolidated net income	375,000	314,000	1,211,000	1,095,000
Operating Segments [Member]
Consolidated net income	2,610,000	2,289,000	6,825,000	5,243,000
Corporate, Non-Segment [Member]
Consolidated net income	1,162,000	1,736,000	3,462,000	4,138,000
Consolidated net income	1,019,000	306,000	2,323,000	741,000
Provision for income taxes	$ 429,000	$ 247,000	$ 1,040,000	$ 364,000