Note 10 - Activity of Business Segments - Reconciliation of Total Segment Income to Total Consolidated Net Income (Details) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Net income (numerator)	$ 148,000	$ 269,000
Provision for income taxes	28,000	86,000
Building Supply [Member] | Operating Segments [Member]
Net income (numerator)	653,000	750,000
Disposable Protective Apparel [Member] | Operating Segments [Member]
Net income (numerator)	331,000	240,000
Infection Control [Member] | Operating Segments [Member]
Net income (numerator)	387,000	321,000
Operating Segments [Member]
Net income (numerator)	1,371,000	1,311,000
Corporate, Non-Segment [Member]
Net income (numerator)	1,195,000	1,147,000
Common Stock [Member]
Gain on sale of marketable securities and investment in common stock warrants		$ 191,000