Note 10 - Reconciliation of Total Segment Income to Total Consolidated Net Income (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Operating Segments [Member] | Building Supply [Member]
Consolidated net income	$ 1,657,000	$ 982,000	$ 2,670,000	$ 1,635,000
Operating Segments [Member] | Disposable Protective Apparel [Member]
Consolidated net income	375,000	207,000	710,000	538,000
Operating Segments [Member] | Infection Control [Member]
Consolidated net income	381,000	393,000	836,000	780,000
Operating Segments [Member]
Consolidated net income	2,413,000	1,582,000	4,216,000	2,953,000
Corporate, Non-Segment [Member]
Consolidated net income	1,230,000	1,205,000	2,300,000	2,400,000
Consolidated net income	797,000	288,000	1,304,000	436,000
Provision for income taxes	$ 386,000	$ 89,000	$ 612,000	$ 117,000