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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 9 Months Ended
Sep. 30, 2024
Mar. 31, 2024
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Sep. 30, 2024
Sep. 30, 2023
Income $ 862,000 $ 576,000 $ 1,430,000 $ 1,146,000 $ 552,000 $ 3,082,000 $ 3,128,000
Provision for income taxes 237,000   395,000     858,000 974,000
Operating Segments [Member]              
Income 2,306,000   2,955,000     7,970,000 7,546,000
Operating Segments [Member] | Building Supply [Member]              
Income 1,294,000   1,973,000     4,086,000 4,456,000
Operating Segments [Member] | Disposable Protective Apparel [Member]              
Income 1,012,000   982,000     3,884,000 3,090,000
Segment Reporting, Reconciling Item, Corporate Nonsegment [Member]              
Income $ 1,207,000   $ 1,130,000     $ 4,030,000 $ 3,444,000