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Note 5 - Goodwill and Other Intangible Assets, Net - Goodwill By Reportable Segment (Details) - USD ($)
3 Months Ended 9 Months Ended 12 Months Ended
Jun. 30, 2022
Sep. 30, 2022
Dec. 31, 2021
Beginning Balance   $ 14,404,618 $ 11,505,852
Acquisitions $ 1,900,000 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