| Schedule of Goodwill [Table Text Block] |
| | | June 30, | | | December 31, | |
| | | 2025 | | | 2024 | |
| Commercial Air Handling Equipment Segment: | | | | | | | | |
| Beginning Balance | | $ | 478,256 | | | $ | 478,256 | |
| Acquisitions | | | 3,922,172 | | | | - | |
| Adjustments | | | - | | | | - | |
| Ending Balance | | $ | 4,400,428 | | | $ | 478,256 | |
| | | | | | | | | |
| Industrial and Transportation Products Segment: | | | | | | | | |
| Beginning Balance | | $ | 18,069,448 | | | $ | 15,974,793 | |
| Acquisitions | | | - | | | | 2,094,655 | |
| Adjustments | | | 154,024 | | | | - | |
| Ending Balance | | $ | 18,223,472 | | | $ | 18,069,448 | |
| | | | | | | | | |
| Total Company: | | | | | | | | |
| Beginning Balance | | $ | 18,547,704 | | | $ | 16,453,049 | |
| Acquisitions | | | 3,922,172 | | | | 2,094,655 | |
| Adjustments | | | 154,024 | | | | - | |
| Ending Balance | | $ | 22,623,900 | | | $ | 18,547,704 | |
|
| Schedule of Finite-Lived Intangible Assets [Table Text Block] |
| | | June 30, | | | December 31, | |
| | | 2025 | | | 2024 | |
| Customer list intangibles | | $ | 16,750,000 | | | $ | 12,650,000 | |
| Non-compete agreements | | | 200,000 | | | | 200,000 | |
| Trademarks | | | 4,610,495 | | | | 4,604,455 | |
| Total intangible assets | | | 21,560,495 | | | | 17,454,455 | |
| Less: accumulated amortization | | | 8,058,574 | | | | 7,168,674 | |
| Intangible assets, net | | $ | 13,501,921 | | | $ | 10,285,781 | |
|