Income taxes - Deferred Tax Assets and Liabilities (Details) - USD ($)	Dec. 31, 2025	Dec. 31, 2024
Deferred tax assets
Allowance for credit losses	$ 46,824	$ 45,859
Other reserve	157,620	127,515
Accrued expenses	149,705	152,600
Lease liability	1,131,158	1,464,256
Charitable contributions	923	331
Business interest limitation	927,728	634,794
Net operating loss – federal	2,257,513	976,500
Net operating loss – state	573,279	328,861
Other	211,125	186,554
Total deferred tax assets	5,455,875	3,917,270
Less: valuation allowance	(4,013,288)	0
Net deferred tax assets	1,442,587	3,917,270
Deferred tax liabilities
Fixed assets	1,140,919	1,416,178
Intangibles	90,087	(164,493)
Total deferred tax liabilities	1,231,006	1,251,685
Deferred tax assets, net of deferred tax liabilities	$ 211,581	$ 2,665,585