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Note 15 - Activity of Business Segments - Reconciliation of Total Segment Income to Total Consolidated Net Income (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Consolidated net income | $ 3,000,000 | $ 3,625,000
Provision for income taxes | 680,000 | 789,000
Operating Segments [Member] |  |
Consolidated net income | 7,347,000 | 8,420,000
Operating Segments [Member] | Building Supply [Member] |  |
Consolidated net income | 3,491,000 | 3,836,000
Operating Segments [Member] | Disposable Protective Apparel [Member] |  |
Consolidated net income | 3,856,000 | 4,584,000
Corporate, Non-Segment [Member] |  |
Consolidated net income | $ 3,667,000 | $ 4,006,000

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