Discontinued Operations (Details) - USD ($)	3 Months Ended								12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash Provided by (Used in) Operating Activities, Discontinued Operations									$ 3,553,854	$ 19,511,343	$ 16,660,950
Disposal Group, Including Discontinued Operation, Cash and Cash Equivalents	$ 0				$ 19,612,471				0	19,612,471	3,618,474	$ 4,281,761
Disposal Group, Including Discontinued Operation, Revenue									9,693,367	46,037,802
Revenues	156,997,000	$ 137,639,000	$ 127,116,000	$ 122,790,000	141,399,000	$ 125,704,000	$ 118,929,000	$ 116,638,000	544,542,925	502,668,332	490,821,420
Disposal Group, Including Discontinued Operation, Other Expense									1,809,059	13,358,989
Provision for Loan and Lease Losses	28,533,000	48,944,000	40,359,000	30,591,000	16,631,000	40,456,000	32,824,000	27,710,000	148,426,578	117,620,140	119,095,712
General and Administrative Expense	78,626,000	76,964,000	64,936,000	67,777,000	75,282,000	64,850,000	62,767,000	66,208,000	288,303,715	269,107,669	244,273,626
Interest Expense	4,914,000	4,637,000	4,158,000	4,225,000	5,052,000	5,001,000	4,791,000	4,247,000	17,934,060	19,089,635	21,504,208
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax									2,341,825	4,353,617	8,049,257
Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax									(38,377,623)	0	0
Discontinued Operation, Tax Effect of Discontinued Operation									626,583	(243,321)	2,239,345
Income Tax Expense (Benefit)	6,984,000	834,000	3,604,000	4,559,000	18,778,000	15,204,000	6,511,000	7,265,000	15,981,057	47,757,808	38,157,492
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent	$ 0	$ 0	$ 479,000	$ (37,141,000)	3,487,000	$ 1,487,000	$ (2,236,000)	$ 1,859,000	(36,662,381)	4,596,938	5,809,912
Disposal Group, Including Discontinued Operation, Accounts, Notes and Loans Receivable, Net					46,027,200					46,027,200
Disposal Group, Including Discontinued Operation, Property, Plant and Equipment					2,805,467					2,805,467
Disposal Group, Including Discontinued Operation, Deferred Tax Assets					10,064,489					10,064,489
Disposal Group, Including Discontinued Operation, Other Assets					965,770					965,770
Disposal Group, Including Discontinued Operation, Assets					79,475,397					79,475,397
Disposal Group, Including Discontinued Operation, Accrued Income Tax Payable, Current					437,551					437,551
Disposal Group, Including Discontinued Operation, Accounts Payable and Accrued Liabilities					6,940,880					6,940,880
Disposal Group, Including Discontinued Operation, Liabilities					$ 7,378,431					7,378,431
Cash Provided by (Used in) Investing Activities, Discontinued Operations									1,138,084	(3,649,778)	(17,648,839)
Cash Provided by (Used in) Financing Activities, Discontinued Operations									$ (17,126,000)	$ 0	1,100,000
MEXICO
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenues											40,913,304
Provision for Loan and Lease Losses											9,476,450
Income Tax Expense (Benefit)											$ 2,239,345