Note 10 - Activity of Business Segments - Reconciliation of Total Segment Income to Total Consolidated Net Income (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Operating Segments [Member] | Building Supply [Member]
Net income (numerator)	$ 1,241,000	$ 1,749,000	$ 2,876,000	$ 3,893,000
Operating Segments [Member] | Disposable Protective Apparel [Member]
Net income (numerator)	734,000	395,000	1,272,000	1,161,000
Operating Segments [Member] | Infection Control [Member]
Net income (numerator)	314,000	392,000	1,095,000	1,047,000
Operating Segments [Member]
Net income (numerator)	2,289,000	2,536,000	5,243,000	6,101,000
Corporate, Non-Segment [Member]
Net income (numerator)	$ 1,736,000	$ 1,110,000	$ 4,138,000	3,387,000
Common Stock [Member]
Net income (numerator)
Gain on sale of marketable securities and investment in common stock warrants				409,000
Net income (numerator)	$ 306,000	$ 966,000	$ 741,000	2,130,000
Provision for income taxes	$ 247,000	$ 460,000	$ 364,000	993,000
Gain on sale of marketable securities and investment in common stock warrants				$ 379,000