Allowance for Credit Losses and Credit Quality Information (Nonaccrual) (Details) - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2021	Mar. 31, 2020
Financing Receivable, Nonaccrual [Line Items]
Uncollected accrued interest reversed	$ 6,200,000	$ 22,400,000
Financing receivable, nonaccrual	61,731,356	61,731,356	$ 83,126,604
Financing receivable, nonaccrual, no allowance	0	0
Interest Income Recognized		14,690,456
Nonaccrual status
Financing Receivable, Nonaccrual [Line Items]
Unearned interest, insurance and fees	(20,894,036)	(20,894,036)	(28,510,140)
61-90 days past due
Financing Receivable, Nonaccrual [Line Items]
Financing receivable, nonaccrual	0	0
Tax Advance Loan
Financing Receivable, Nonaccrual [Line Items]
Financing receivable, nonaccrual	46,269	46,269	41,573
Financing receivable, nonaccrual, no allowance	0	0
Tax Advance Loan | 61-90 days past due
Financing Receivable, Nonaccrual [Line Items]
Financing receivable, nonaccrual	0	0
0 to 5 months
Financing Receivable, Nonaccrual [Line Items]
Financing receivable, nonaccrual	17,191,922	17,191,922	26,040,593
Financing receivable, nonaccrual, no allowance	0	0
Interest Income Recognized		1,705,371
0 to 5 months | 61-90 days past due
Financing Receivable, Nonaccrual [Line Items]
Financing receivable, nonaccrual	0	0
6 to 17 months
Financing Receivable, Nonaccrual [Line Items]
Financing receivable, nonaccrual	13,211,641	13,211,641	17,466,450
Financing receivable, nonaccrual, no allowance	0	0
Interest Income Recognized		2,433,144
6 to 17 months | 61-90 days past due
Financing Receivable, Nonaccrual [Line Items]
Financing receivable, nonaccrual	0	0
18 to 35 months
Financing Receivable, Nonaccrual [Line Items]
Financing receivable, nonaccrual	12,088,377	12,088,377	13,723,295
Financing receivable, nonaccrual, no allowance	0	0
Interest Income Recognized		2,195,160
18 to 35 months | 61-90 days past due
Financing Receivable, Nonaccrual [Line Items]
Financing receivable, nonaccrual	0	0
36 to 59 months
Financing Receivable, Nonaccrual [Line Items]
Financing receivable, nonaccrual	8,161,951	8,161,951	10,071,288
Financing receivable, nonaccrual, no allowance	0	0
Interest Income Recognized		1,609,059
36 to 59 months | 61-90 days past due
Financing Receivable, Nonaccrual [Line Items]
Financing receivable, nonaccrual	0	0
60+ Months
Financing Receivable, Nonaccrual [Line Items]
Financing receivable, nonaccrual	31,925,232	31,925,232	$ 44,293,545
Financing receivable, nonaccrual, no allowance	0	0
Interest Income Recognized		6,747,722
60+ Months | 61-90 days past due
Financing Receivable, Nonaccrual [Line Items]
Financing receivable, nonaccrual	$ 0	$ 0