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Income taxes - current and deferred tax expense (Details) - USD ($)	12 Months Ended
	Feb. 28, 2025	Feb. 29, 2024
Income Tax Disclosure [Abstract]
Federal	$ 548,743	$ 716,003
State	78,543	123,743
Total current income tax	627,286	839,746
Federal	(318,949)	(471,396)
State	(47,659)	(65,233)
Total deferred income tax	(366,608)	(536,629)
Income tax expense	$ 260,678	$ 303,117

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