Summary of Significant Accounting Policies (Details)	3 Months Ended								12 Months Ended
	Mar. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2020 USD ($) segments	Mar. 31, 2019 USD ($)	Mar. 31, 2018 USD ($)	Mar. 31, 2017 USD ($)
Schedule of Subsidiaries Information [Line Items]
Document Fiscal Year Focus									2020
Advertising Expense									$ 24,304,023	$ 22,482,553	$ 21,195,718
Gross loan balance	$ 1,209,871,366				$ 1,127,957,383				$ 1,209,871,366	1,127,957,383
Business Segments [Abstract]
Number of reportable segments | segments									1
Document Period End Date									Mar. 31, 2020
Current Fiscal Year End Date									--03-31
Total assets	1,030,086,435				854,988,073				$ 1,030,086,435	854,988,073
Total revenues	$ 163,018,000	$ 146,996,000	$ 141,573,000	$ 138,441,000	156,997,000	$ 137,639,000	$ 127,116,000	$ 122,790,000	$ 590,029,015	544,542,925	502,668,332
Cash and Cash Equivalents [Abstract]
Periods of maturity of highly liquid investments (in months)									3 months
Loans and Interest Income [Abstract]
Percentage of present value of new loan terms to remaining cash flows under original loan, Minimum (in hundredths)	10.00%								10.00%
Allowance for loan losses [Abstract]
Principal loans more than ninety days past due included in loan loss reserves (in hundredths)	100.00%								100.00%
General reserve percentage									4.25%
Average loan life									8 months
Impaired loans [Abstract]
Number of days past due for loans to be classified as impaired, Minimum (in days)									91 days or more
Net investment in loans deemed uncollectible charged-off (in hundredths)	100.00%								100.00%
Bankrupt accounts that had not been charged off	$ 6,300,000								$ 6,300,000
Accounts past due, reserved (in hundredths)	100.00%								100.00%
Restricted Cash and Cash Equivalents	$ 5,400,000				5,100,000				$ 5,400,000	5,100,000
Stock Repurchase Program, Remaining Authorized Repurchase Amount	22,600,000								22,600,000
Stockholders' Equity Attributable to Parent	411,963,067				552,116,625				$ 411,963,067	552,116,625	$ 541,107,852	$ 461,063,577
Minimum [Member]
Allowance for loan losses [Abstract]
Historial loss ratio, percentage									12.80%
Maximum [Member]
Allowance for loan losses [Abstract]
Historial loss ratio, percentage									18.00%
Small loans [Member]
Schedule of Subsidiaries Information [Line Items]
Gross loan balance	761,364,753				736,643,663				$ 761,364,753	736,643,663
Large loans [Member] [Member]
Schedule of Subsidiaries Information [Line Items]
Gross loan balance	442,683,915				383,686,372				442,683,915	383,686,372
Sales finance loans [Member]
Schedule of Subsidiaries Information [Line Items]
Gross loan balance					$ 7,627,348					$ 7,627,348
Loans and Finance Receivables [Member]
Schedule of Subsidiaries Information [Line Items]
Gross loan balance	$ 5,822,698								$ 5,822,698
UNITED STATES
Schedule of Subsidiaries Information [Line Items]
Number of offices operated in the United States of America	1,243								1,243
MEXICO
Schedule of Subsidiaries Information [Line Items]
Number of offices operated in the United States of America	0								0
Noncompete Agreements [Member]
Schedule of Subsidiaries Information [Line Items]
Finite-Lived Intangible Asset, Useful Life									4 years 10 months 24 days
Noncompete Agreements [Member] | Minimum [Member]
Schedule of Subsidiaries Information [Line Items]
Finite-Lived Intangible Asset, Useful Life									3 years
Noncompete Agreements [Member] | Maximum [Member]
Schedule of Subsidiaries Information [Line Items]
Finite-Lived Intangible Asset, Useful Life									5 years 3 months 18 days