Note 14 - Activity of Business Segments (Details) - Reconciliation of Total Segment Income to Total Consolidated Net Income (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Segment Reporting, Revenue Reconciling Item [Line Items]
Consolidated net income	$ 2,742,000	$ 2,079,000
Provision for income taxes	1,201,000	885,000
Gain on sale of marketable securities and investment in common stock warrants	379,000
Common Stock [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Gain on sale of marketable securities and investment in common stock warrants	409,000	350,000
Operating Segments [Member] | Building Supply [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Consolidated net income	4,750,000	4,709,000
Operating Segments [Member] | Disposable Protective Apparel [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Consolidated net income	1,601,000	1,534,000
Operating Segments [Member] | Infection Control [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Consolidated net income	1,953,000	1,144,000
Operating Segments [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Consolidated net income	8,304,000	7,387,000
Corporate, Non-Segment [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Consolidated net income	$ 4,770,000	$ 4,773,000