Income taxes - Deferred Tax Assets and Liabilities (Details) - USD ($)	Mar. 31, 2026	Dec. 31, 2025
Deferred tax assets
Allowance for credit losses	$ 48,066	$ 46,824
Other reserve	138,103	157,620
Accrued expenses	157,068	149,705
Lease liability	1,063,602	1,131,158
Charitable contributions	923	923
Business interest limitation	927,785	927,728
Net operating loss – federal	2,475,315	2,257,513
Net operating loss – state	648,418	573,279
Other	211,330	211,125
Total deferred tax assets	5,670,610	5,455,875
Less: valuation allowance	(4,294,339)	(4,013,288)
Net deferred tax assets	1,376,271	1,442,587
Deferred tax liabilities
Fixed assets	1,050,766	1,140,919
Intangibles	113,745	90,087
Total deferred tax liabilities	1,164,511	1,231,006
Deferred tax assets, net of deferred tax liabilities	$ 211,760	$ 211,581