| Summary of changes in goodwill |
Changes in goodwill for the nine months ended September 30, 2021 consists of the following: | | | | | | Goodwill | Balance at December 31, 2020 | | $ | 7,913,123 | Acquisition of Zodega subsidiaries | | | 4,593,750 | Balance at September 30, 2021 | | $ | 12,506,873 |
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| Schedule of intangible assets |
| | | | | | | | | | | | | | Weighted average | | September 30, 2021 | | | amortization period | | | | | Accumulated | | | | | | (in years) | | Gross | | Amortization | | Net | Tradenames | | 7.5 | | $ | 932,000 | | $ | (220,927) | | $ | 711,073 | Customer relationships | | 5.7 | | | 3,289,000 | | | (1,048,233) | | $ | 2,240,767 | Non-compete agreements | | 6.6 | | | 564,000 | | | (146,588) | | $ | 417,412 | | | | | $ | 4,785,000 | | $ | (1,415,748) | | $ | 3,369,252 |
| | | | | | | | | | | | | | Weighted average | | December 31, 2020 | | | amortization period | | | | | Accumulated | | | | | | (in years) | | Gross | | Amortization | | Net | Tradenames | | 7.5 | | $ | 932,000 | | $ | (125,708) | | $ | 806,292 | Customer relationships | | 5.7 | | | 3,289,000 | | | (611,709) | | $ | 2,677,291 | Non-compete agreements | | 6.6 | | | 564,000 | | | (79,893) | | $ | 484,107 | | | | | $ | 4,785,000 | | $ | (817,310) | | $ | 3,967,690 |
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| Schedule of estimated aggregate amortization expense |
| | | | 2021 (excluding the nine months ended September 30, 2021) | | $ | 199,480 | 2022 | | | 797,920 | 2023 | | | 797,920 | 2024 | | | 781,670 | 2025 | | | 535,087 | Thereafter | | | 257,175 | Total | | $ | 3,369,252 |
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