Allowance for Credit Losses and Credit Quality Information (Summary of Past Due Receivables) (Details) - USD ($)	Mar. 31, 2021	Mar. 31, 2020
Contractual basis
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, percent past due	9.70%	12.80%
Contractual basis | 30-60 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, percent past due	2.90%
Financing receivable, past due	$ 31,933,140	$ 49,137,102
Contractual basis | 61-90 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, percent past due	2.20%
Financing receivable, past due	$ 24,514,370	35,020,925
Contractual basis | 91 days or more past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, percent past due	4.60%
Financing receivable, past due	$ 51,092,036	70,719,727
Contractual basis | Total
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, past due	$ 107,539,546	$ 154,877,754
Recency Basis
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, percent past due	7.10%	10.50%
Recency Basis | 30-60 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, percent past due	2.20%
Financing receivable, past due	$ 24,742,398	$ 48,206,910
Recency Basis | 61-90 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, percent past due	1.80%
Financing receivable, past due	$ 19,348,757	28,450,942
Recency Basis | 91 days or more past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, percent past due	3.10%
Financing receivable, past due	$ 34,494,041	50,669,837
Recency Basis | Total
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, past due	$ 78,585,196	$ 127,327,689