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