Income taxes - Provision for income taxes (Details) - USD ($)	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Current:
Federal	$ 1,160,917	$ 2,282,566	$ 5,611,360
State	507,180	255,835	1,663,653
Total current income tax provision (benefit)	1,668,097	2,538,401	7,275,013
Deferred:
Federal	457,068	(267,100)	(276,070)
State	39,483	(52,787)	(248,929)
Total deferred income tax provision (benefit)	496,551	(319,887)	(524,999)
Total provision for (benefit from) income taxes	$ 2,164,648	$ 2,218,514	$ 6,750,014