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Summary of Significant Accounting Policies - Reconciliation of the changes in the allowance for credit losses on contracts (Details 5) (USD $) | 3 Months Ended | 12 Months Ended
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Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2013 | Mar. 31, 2012 | Mar. 31, 2011
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Provision for credit losses | $ 3,542,077 | $ 3,484,811 | $ 3,261,721 | $ 3,103,266 | $ 2,600,949 | $ 3,507,659 | $ 3,209,524 | $ 3,049,461 | $ 13,391,875 | $ 12,367,593 | $ 15,611,544
Contracts |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of year |  |  |  | 19,499,208 |  |  |  | 19,952,595 | 19,499,208 | 19,952,595 | 16,383,893
Discounts acquired on new volume |  |  |  |  |  |  |  |  |  |  |
Provision for credit losses |  |  |  |  |  |  |  |  | 13,252,382 | 12,185,529 | 15,485,607
Losses absorbed |  |  |  |  |  |  |  |  | (19,851,080) | (14,971,422) | (14,036,888)
Recoveries |  |  |  |  |  |  |  |  | 3,190,142 | 2,405,750 | 2,255,683
Discounts accreted |  |  |  |  |  |  |  |  |  | (73,244) | (135,700)
Balance at end of year | 16,090,652 |  |  |  | 19,499,208 |  |  |  | 16,090,652 | 19,499,208 | 19,952,595
Reported |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Provision for credit losses |  |  |  |  |  |  |  |  |  | 5,319 | 4,610,221
Reported | Contracts |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of year |  |  |  |  |  |  |  | 35,895,449 |  | 35,895,449 | 30,408,578
Discounts acquired on new volume |  |  |  |  |  |  |  |  |  | 12,415,896 | 12,919,492
Provision for credit losses |  |  |  |  |  |  |  |  |  | (176,745) | 4,484,284
Losses absorbed |  |  |  |  |  |  |  |  |  | (14,971,422) | (14,036,888)
Recoveries |  |  |  |  |  |  |  |  |  | 2,405,750 | 2,255,683
Discounts accreted |  |  |  |  |  |  |  |  |  | (73,244) | (135,700)
Balance at end of year |  |  |  |  | 35,495,684 |  |  |  |  | 35,495,684 | 35,895,449
Correction |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Provision for credit losses |  |  |  |  |  |  |  |  |  | 12,362,274 | 11,001,323
Correction | Contracts |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of year |  |  |  |  |  |  |  | (15,942,854) |  | (15,942,854) | (14,024,685)
Discounts acquired on new volume |  |  |  |  |  |  |  |  |  | (12,415,896) | (12,919,492)
Provision for credit losses |  |  |  |  |  |  |  |  |  | 12,362,274 | 11,001,323
Losses absorbed |  |  |  |  |  |  |  |  |  |  |
Recoveries |  |  |  |  |  |  |  |  |  |  |
Discounts accreted |  |  |  |  |  |  |  |  |  |  |
Balance at end of year |  |  |  |  | $ (15,996,476) |  |  |  |  | $ (15,996,476) | $ (15,942,854)

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