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Note 5 - Goodwill and Other Intangible Assets, Net - Goodwill By Reportable Segment (Details) - USD ($)	6 Months Ended	12 Months Ended
	Jun. 30, 2022	Dec. 31, 2021
Beginning Balance	$ 14,404,618	$ 11,505,852
Acquisitions	1,922,513	2,898,766
Adjustments	(169,854)	0
Ending Balance	16,157,277	14,404,618
Commercial Air Handling [Member]
Beginning Balance	478,256	478,256
Acquisitions	0	0
Adjustments	0	0
Ending Balance	478,256	478,256
Industrial and Transportation Products [Member]
Beginning Balance	13,926,362	11,027,596
Acquisitions	1,922,513	2,898,766
Adjustments	(169,854)	0
Ending Balance	$ 15,679,021	$ 13,926,362

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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