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Leases - Lease assets and liabilities (Details) - USD ($) | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Current |  |
Current assets of discontinued operations | $ 2,654 |
Noncurrent |  |
Operating lease right-of-use assets | 2,681,137 | $ 1,329,561
Long-term assets of discontinued operations | 16,898 | 33,909
Total lease right-of-use assets | 2,700,689 | 1,471,773
Current |  |
Current maturities of operating leases | 592,336 | 455,788
Current liabilities of discontinued operations | 11,195 | 29,432
Noncurrent |  |
Noncurrent operating leases | 2,137,394 | 982,076
Noncurrent liabilities of discontinued operations | 7,819 | 2,499
Total lease liabilities | $ 2,748,744 | $ 1,469,795
Operating leases, weighted average remaining lease term | 7 years | 3 years 4 months 24 days
Operating leases, weighted average discount rate | 5.03% | 4.15%
Discontinued Operations |  |
Noncurrent |  |
Operating leases, weighted average remaining lease term | 1 year 7 months 6 days | 1 year 1 month 6 days
Operating leases, weighted average discount rate | 4.77% | 3.48%
Prepaid Expenses and Other Current Assets [Member] |  |
Current |  |
Operating lease assets, current |  | $ 108,303

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