Note 10 - Activity of Business Segments - Reconciliation of Total Segment Income to Total Consolidated Net Income (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Building Supply [Member] | Operating Segments [Member]
Net income (numerator)	$ 982,000	$ 1,394,000	$ 1,635,000	$ 2,144,000
Disposable Protective Apparel [Member] | Operating Segments [Member]
Net income (numerator)	207,000	524,000	538,000	766,000
Infection Control [Member] | Operating Segments [Member]
Net income (numerator)	393,000	335,000	780,000	655,000
Operating Segments [Member]
Net income (numerator)	1,582,000	2,253,000	2,953,000	3,565,000
Corporate, Non-Segment [Member]
Net income (numerator)	$ 1,205,000	1,129,000	$ 2,400,000	2,277,000
Common Stock [Member]
Net income (numerator)
Gain on sale of marketable securities and investment in common stock warrants		218,000		409,000
Net income (numerator)	$ 288,000	895,000	$ 436,000	1,164,000
Provision for income taxes	$ 89,000	$ 447,000	$ 117,000	$ 533,000