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Note 10 - Segments Reporting - Consolidated Net Property and Equipment, Goodwill and Intangible Assets (Details) - USD ($)
Sep. 30, 2025
Dec. 31, 2024
Assets $ 8,262,000 $ 8,575,000
Operating Segments [Member]    
Assets 7,126,000 7,493,000
Operating Segments [Member] | Building Supply [Member]    
Assets 5,770,000 6,069,000
Operating Segments [Member] | Disposable Protective Apparel [Member]    
Assets 1,356,000 1,424,000
Segment Reporting, Reconciling Item, Corporate Nonsegment [Member]    
Assets $ 1,136,000 $ 1,082,000