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Income taxes - current and deferred tax expense (Details) - USD ($)
12 Months Ended
Feb. 29, 2024
Feb. 28, 2023
Current:    
Federal $ 716,003 $ 438,263
State 123,743 83,525
Total current income tax 839,746 521,788
Federal (471,396) (321,458)
State (65,233) (46,321)
Total deferred income tax (536,629) (367,779)
Income tax expense $ 303,117 $ 154,009