Leases - Lease assets and liabilities (Details) - USD ($)	Dec. 31, 2023	Dec. 31, 2022
Current
Current assets of discontinued operations		$ 7,979
Noncurrent
Operating lease right-of-use assets	$ 2,135,446	2,058,384
Total lease right-of-use assets	2,245,987	2,101,987
Current
Current maturities of operating leases	456,865	546,851
Current liabilities of discontinued operations		7,361
Noncurrent
Noncurrent operating leases	1,827,302	1,590,542
Total lease liabilities	$ 2,284,167	$ 2,144,754
Operating leases, weighted average remaining lease term	6 years 1 month 6 days	6 years 7 months 6 days
Operating leases, weighted average discount rate	5.67%	5.11%
Discontinued Operations.
Noncurrent
Operating leases, weighted average remaining lease term	0 years	9 months 18 days
Operating leases, weighted average discount rate	0.00%	4.96%
Prepaid Expenses and Other Current Assets [Member]
Current
Operating lease assets, current	$ 110,541	$ 35,624