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Leases - Lease assets and liabilities (Details) - USD ($) | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Current |  |
Current assets of discontinued operations |  | $ 2,654
Noncurrent |  |
Operating lease right-of-use assets | $ 2,298,165 | 2,681,137
Long-term assets of discontinued operations | 12,517 | 16,898
Total lease right-of-use assets | 2,381,032 | 2,700,689
Current |  |
Current maturities of operating leases | 563,643 | 592,336
Current liabilities of discontinued operations | 8,394 | 11,195
Noncurrent |  |
Noncurrent operating leases | 1,850,860 | 2,137,394
Noncurrent liabilities of discontinued operations | 2,921 | 7,819
Total lease liabilities | $ 2,425,818 | $ 2,748,744
Operating leases, weighted average remaining lease term | 6 years 9 months 18 days | 7 years
Operating leases, weighted average discount rate | 5.06% | 5.03%
Discontinued Operations. |  |
Noncurrent |  |
Operating leases, weighted average remaining lease term | 1 year 4 months 24 days | 1 year 7 months 6 days
Operating leases, weighted average discount rate | 4.96% | 4.77%
Prepaid Expenses and Other Current Assets [Member] |  |
Current |  |
Operating lease assets, current | $ 70,350 |

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