Note 10 - Activity of Business Segments (Details) - Reconciliation of Total Segment Income to Total Consolidated Net Income (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Segment Reporting, Revenue Reconciling Item [Line Items]
Consolidated net income	$ 966,000	$ 905,000	$ 2,130,000	$ 1,395,000
Provision for income taxes	460,000	408,000	993,000	660,000
Common Stock [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Gain on marketable securities			409,000
Operating Segments [Member] | Building Supply [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Consolidated net income	1,749,000	1,668,000	3,893,000	3,668,000
Operating Segments [Member] | Disposable Protective Apparel [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Consolidated net income	395,000	389,000	1,161,000	950,000
Operating Segments [Member] | Infection Control [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Consolidated net income	392,000	403,000	1,047,000	1,052,000
Operating Segments [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Consolidated net income	2,536,000	2,460,000	6,101,000	5,670,000
Corporate, Non-Segment [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Consolidated net income	$ 1,110,000	$ 1,147,000	$ 3,387,000	$ 3,615,000