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Note 14 - Activity of Business Segments - Consolidated Net Sales (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Net sales	$ 46,176,000	$ 44,955,000
Building Supply [Member] \| Operating Segments [Member]
Net sales	27,343,000	25,800,000
Disposable Protective Apparel [Member] \| Operating Segments [Member]
Net sales	14,219,000	14,661,000
Infection Control [Member] \| Operating Segments [Member]
Net sales	$ 4,614,000	$ 4,494,000