Note 5 - Goodwill and Other Intangible Asset - Goodwill By Reportable Segment (Details) - USD ($)	3 Months Ended	12 Months Ended
Mar. 31, 2025	Dec. 31, 2024
Beginning Balance	$ 18,547,704	$ 16,453,049
Acquisitions	3,907,172	2,094,655
Adjustments	154,024	0
Ending Balance	22,608,900	18,547,704
Commercial Air Handling [Member]
Beginning Balance	478,256	478,256
Acquisitions	3,907,172	0
Adjustments	0	0
Ending Balance	4,385,428	478,256
Industrial and Transportation Products [Member]
Beginning Balance	18,069,448	15,974,793
Acquisitions	0	2,094,655
Adjustments	154,024	0
Ending Balance	$ 18,223,472	$ 18,069,448

Amount, after accumulated impairment loss, of asset representing future economic benefit arising from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized.

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+ Details