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Note 10 - Segment Reporting - Segment Information (Details) - USD ($)
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Segment sales $ 13,822,000 $ 13,482,000
Net sales 13,822,000 13,482,000
Cost of goods sold 8,430,000 8,065,000
Selling, general and administrative 4,694,000 4,847,000
Depreciation and amortization 243,000 244,000
Other income 317,000 396,000
Segment net income 613,000 576,000
Operating Segments [Member]    
Segment net income 1,992,000 1,995,000
Operating Segments [Member] | Building Supply [Member]    
Segment sales 8,372,000 8,240,000
Net sales 8,372,000 8,240,000
Cost of goods sold 5,368,000 5,223,000
Selling, general and administrative 1,878,000 1,986,000
Depreciation and amortization 189,000 185,000
Other income (119,000) (117,000)
Segment net income 1,056,000 963,000
Operating Segments [Member] | Disposable Protective Apparel [Member]    
Segment sales 5,450,000 5,242,000
Net sales 5,450,000 5,242,000
Cost of goods sold 3,062,000 2,842,000
Selling, general and administrative 1,446,000 1,359,000
Depreciation and amortization 27,000 30,000
Other income (21,000) (21,000)
Segment net income $ 936,000 $ 1,032,000