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Leases - Lease assets and liabilities (Details) - USD ($)
Sep. 30, 2021
Dec. 31, 2020
Current    
Current assets of discontinued operations $ 10,570  
Noncurrent    
Operating lease right-of-use assets 2,855,346 $ 1,329,561
Long-term assets of discontinued operations   33,909
Total lease right-of-use assets 2,895,275 1,471,773
Current    
Current maturities of operating leases 563,154 455,788
Current liabilities of discontinued operations 9,778 29,432
Noncurrent    
Noncurrent operating leases 2,321,551 982,076
Noncurrent liabilities of discontinued operations 0 2,499
Total lease obligations $ 2,894,483 $ 1,469,795
Operating leases, weighted average remaining lease term 7 years 1 month 6 days 3 years 4 months 24 days
Operating leases, weighted average discount rate 4.96% 4.15%
Discontinued Operations    
Noncurrent    
Operating leases, weighted average remaining lease term 4 months 24 days 1 year 1 month 6 days
Operating leases, weighted average discount rate 3.48% 3.48%
Accounts Receivable [Member]    
Current    
Operating lease assets, current $ 21,131  
Prepaid Expenses and Other Current Assets [Member]    
Current    
Operating lease assets, current $ 8,228 $ 108,303