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Note 10 - Activity of Business Segments - Consolidated Net Sales (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Net sales $ 14,251,000 $ 16,053,000 $ 44,023,000 $ 45,967,000
Operating Segments [Member] | Building Supply [Member]        
Net sales 8,798,000 11,449,000 26,979,000 30,616,000
Operating Segments [Member] | Disposable Protective Apparel [Member]        
Net sales $ 5,453,000 $ 4,604,000 $ 17,044,000 $ 15,351,000