Allowance for Credit Losses and Credit Quality Information (Summary of Impairment) (Details) - USD ($)	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018
Summary of loans individually and collectively evaluated for impairment [Abstract]
Gross loans in bankruptcy, excluding contractually delinquent		$ 5,165,752
Gross loans contractually delinquent		70,719,727
Loans not contractually delinquent and not in bankruptcy		1,133,985,887
Gross loan balance	$ 1,104,746,261	1,209,871,366
Unearned interest and fees		(308,980,724)
Net loans		900,890,642
Allowance for credit losses	$ (91,722,288)	(96,487,856)	$ (81,519,624)	$ (66,088,139)
Loans, net of allowance for loan losses		804,402,786
Loans individually evaluated for impairment (impaired loans)
Summary of loans individually and collectively evaluated for impairment [Abstract]
Gross loans in bankruptcy, excluding contractually delinquent		5,165,752
Gross loans contractually delinquent		70,719,727
Loans not contractually delinquent and not in bankruptcy		0
Gross loan balance		75,885,479
Unearned interest and fees		(16,848,762)
Net loans		59,036,717
Allowance for credit losses		(54,090,509)
Loans, net of allowance for loan losses		4,946,208
Loans collectively evaluated for impairment
Summary of loans individually and collectively evaluated for impairment [Abstract]
Gross loans in bankruptcy, excluding contractually delinquent		0
Gross loans contractually delinquent		0
Loans not contractually delinquent and not in bankruptcy		1,133,985,887
Gross loan balance		1,133,985,887
Unearned interest and fees		(292,131,962)
Net loans		841,853,925
Allowance for credit losses		(42,397,347)
Loans, net of allowance for loan losses		$ 799,456,578