Note 10 - Activity of Business Segments (Details) - Reconciliation of Total Segment Income to Total Consolidated Net Income (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Segment Reporting, Revenue Reconciling Item [Line Items]
Consolidated net income	$ 895,000	$ 474,000	$ 1,164,000	$ 490,000
Provision for income taxes	447,000	264,000	533,000	252,000
Gain on marketable securities	218,000		379,000
Operating Segments [Member] | Building Supply [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Consolidated net income	1,394,000	1,363,000	2,144,000	2,001,000
Operating Segments [Member] | Disposable Protective Apparel [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Consolidated net income	524,000	196,000	766,000	561,000
Operating Segments [Member] | Infection Control [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Consolidated net income	335,000	341,000	655,000	648,000
Operating Segments [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Consolidated net income	2,253,000	1,900,000	3,565,000	3,210,000
Corporate, Non-Segment [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Consolidated net income	$ 1,129,000	$ 1,162,000	$ 2,277,000	$ 2,468,000