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Note 10 - Segments Reporting - Reconciliation of Total Segment Income to Total Consolidated Net Income (Details) - USD ($)	3 Months Ended						9 Months Ended
	Sep. 30, 2025	Jun. 30, 2025	Mar. 31, 2025	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Sep. 30, 2025	Sep. 30, 2024
Segment net income	$ 976,000	$ 1,244,000	$ 613,000	$ 862,000	$ 1,644,000	$ 576,000	$ 2,833,000	$ 3,082,000
Provision for income taxes	317,000			237,000			843,000	858,000
Operating Segments [Member]
Segment net income	2,555,000			2,306,000			7,550,000	7,970,000
Operating Segments [Member] | Building Supply [Member]
Segment net income	1,450,000			1,294,000			4,609,000	4,086,000
Operating Segments [Member] | Disposable Protective Apparel [Member]
Segment net income	1,105,000			1,012,000			2,941,000	3,884,000
Segment Reporting, Reconciling Item, Corporate Nonsegment [Member]
Segment net income	$ 1,262,000			$ 1,207,000			$ 3,874,000	$ 4,030,000

X

- Definition

Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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