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Allowance for Loan Losses and Credit Quality Indicators (Assessment of Credit Quality) (Details) - USD ($)
12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
Delinquent refinance [Member] | Delinquent refinance [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Gross loan balance   $ 18,694,528    
New borrower [Member] | New borrower [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Gross loan balance   138,140,479    
Former borrower [Member] | Former borrower [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Gross loan balance   116,242,182    
Refinance [Member] | Refinance [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Gross loan balance   854,880,194    
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment $ 57,200,000 47,000,000.0 $ 42,300,000  
Loans and Leases Receivable, Deferred Income 308,980,724 290,813,752    
Gross loan balance 1,209,871,366 1,127,957,383    
Bankruptcy, gross loans 5,165,752 4,644,203    
91 days or more delinquent, excluding bankruptcy 70,719,727 59,633,541    
Loans less than 91 days delinquent and not in bankruptcy 1,133,985,887 1,063,679,639    
Financing Receivable Individually Evaluated for Impairment Unearned Interest and Fees   (290,813,752)    
Loans and Leases Receivable, Net of Deferred Income 900,890,642 837,143,631    
Loans and Leases Receivable, Allowance (96,487,856) (81,519,624) $ (66,088,139) $ (60,644,365)
Loans and Leases Receivable, Net Amount 804,402,786 755,624,007    
New borrower [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Gross loan balance 124,800,193      
Former borrower [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Gross loan balance 127,108,125      
Refinance [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Gross loan balance 935,448,882      
Delinquent refinance [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Gross loan balance 22,514,166      
Consumer loans- non-bankrupt accounts [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Gross loan balance 1,203,552,152 1,121,895,834    
Consumer loans- bankrupt accounts [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Gross loan balance 6,319,214 6,061,549    
Loans Individually Evaluated For Impairment [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Gross loan balance 75,885,479 64,277,744    
Bankruptcy, gross loans 5,165,752 4,644,203    
91 days or more delinquent, excluding bankruptcy 70,719,727 59,633,541    
Loans less than 91 days delinquent and not in bankruptcy 0 0    
Financing Receivable Individually Evaluated for Impairment Unearned Interest and Fees (16,848,762) (14,319,795)    
Loans and Leases Receivable, Net of Deferred Income 59,036,717 49,957,949    
Loans and Leases Receivable, Allowance (54,090,509) (45,511,124)    
Loans and Leases Receivable, Net Amount 4,946,208 4,446,825    
Loans Collectively Evaluated For Impairment [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Gross loan balance 1,133,985,887 1,063,679,639    
Bankruptcy, gross loans 0 0    
91 days or more delinquent, excluding bankruptcy 0 0    
Loans less than 91 days delinquent and not in bankruptcy 1,133,985,887 1,063,679,639    
Financing Receivable Individually Evaluated for Impairment Unearned Interest and Fees (292,131,962) (276,493,957)    
Loans and Leases Receivable, Net of Deferred Income 841,853,925 787,185,682    
Loans and Leases Receivable, Allowance (42,397,347) (36,008,500)    
Loans and Leases Receivable, Net Amount 799,456,578 751,177,182    
Performing Financing Receivable [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Gross loan balance 1,104,130,714 1,039,774,448    
Nonperforming Financial Instruments [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Contractual non-performing, 61 days or more delinquent $ 105,740,652 $ 88,182,935