Note 10 - Activity of Business Segments - Consolidated Net Property and Equipment, Goodwill and Intangible Assets (Details) - USD ($)	Sep. 30, 2017	Dec. 31, 2016
Consolidated assets	$ 3,079,000	$ 2,735,000
Operating Segments [Member]
Consolidated assets	2,523,000	2,694,000
Operating Segments [Member] | Building Supply [Member]
Consolidated assets	2,168,000	2,208,000
Operating Segments [Member] | Disposable Protective Apparel [Member]
Consolidated assets	341,000	346,000
Operating Segments [Member] | Infection Control [Member]
Consolidated assets	14,000	140,000
Corporate, Non-Segment [Member]
Consolidated assets	$ 556,000	$ 41,000