Note 10 - Activity of Business Segments - Consolidated Net Sales (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Net sales	$ 12,049,000	$ 11,779,000	$ 34,082,000	$ 36,334,000
Building Supply [Member] | Operating Segments [Member]
Net sales	7,076,000	7,022,000	19,298,000	21,700,000
Disposable Protective Apparel [Member] | Operating Segments [Member]
Net sales	3,845,000	3,698,000	10,914,000	11,147,000
Infection Control [Member] | Operating Segments [Member]
Net sales	$ 1,128,000	$ 1,059,000	$ 3,870,000	$ 3,487,000