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Summary of Significant Accounting Policies - Summary of change to consolidated statements of cash flows (operating activities) (Details 3) (USD $) | 12 Months Ended
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Mar. 31, 2013 | Mar. 31, 2012 | Mar. 31, 2011
Consolidated Statements of Cash Flows (Operating Activities) |  |  |
Net income | $ 19,940,946 | $ 22,221,759 | $ 16,768,294
Provision for credit losses | 13,391,875 | 12,367,593 | 15,611,544
Deferred income taxes | 696,339 | 245,273 | (1,440,668)
Amortization of dealer discounts | (11,482,251) | (12,348,448) | (10,941,553)
Net cash provided by operating activities | 25,620,155 | 21,874,879 | 21,357,624
Reported |  |  |
Consolidated Statements of Cash Flows (Operating Activities) |  |  |
Net income |  | 22,230,292 | 16,805,184
Provision for credit losses |  | 5,319 | 4,610,221
Deferred income taxes |  | 250,566 | (1,417,788)
Amortization of dealer discounts |  |  |
Net cash provided by operating activities |  | 21,874,879 | 21,357,624
Correction |  |  |
Consolidated Statements of Cash Flows (Operating Activities) |  |  |
Net income |  | (8,533) | (36,890)
Provision for credit losses |  | 12,362,274 | 11,001,323
Deferred income taxes |  | (5,293) | (22,880)
Amortization of dealer discounts |  | (12,348,448) | (10,941,553)
Net cash provided by operating activities |  |  |

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