Leases - Lease assets and liabilities (Details) - USD ($)	Dec. 31, 2025	Dec. 31, 2024
ASSETS
Operating lease right-of-use assets	$ 433,058	$ 419,408
Total operating lease right-of-use assets	2,930,441	3,232,786
Current
Current maturities of operating leases	661,047	634,947
Noncurrent
Noncurrent operating leases	2,297,161	2,630,812
Total lease liabilities	$ 2,958,208	$ 3,265,759
Operating leases, weighted average remaining lease term	4 years 2 months 12 days	5 years
Operating leases, weighted average discount rate	6.55%	6.56%