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Note 10 - Activity of Business Segments - Reconciliation of Total Segment Income to Total Consolidated Net Income (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2024
Mar. 31, 2024
Jun. 30, 2023
Mar. 31, 2023
Jun. 30, 2024
Jun. 30, 2023
Income $ 1,644,000 $ 576,000 $ 1,146,000 $ 552,000 $ 2,220,000 $ 1,698,000
Provision for income taxes 475,000   438,000   621,000 579,000
Operating Segments [Member]            
Income 3,669,000   2,851,000   5,664,000 4,591,000
Operating Segments [Member] | Building Supply [Member]            
Income 1,828,000   1,527,000   2,792,000 2,483,000
Operating Segments [Member] | Disposable Protective Apparel [Member]            
Income 1,841,000   1,324,000   2,872,000 2,108,000
Segment Reporting, Reconciling Item, Corporate Nonsegment [Member]            
Income $ 1,550,000   $ 1,267,000   $ 2,823,000 $ 2,314,000