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Finance Receivables (Tables) | 12 Months Ended
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Mar. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Schedule of the credit quality by creditworthiness |
|  | 2013 |  |  | 2012 |
|  | Contracts |  |  | Direct Loans |  |  | Contracts |  |  | Direct Loans |
Non-bankrupt accounts |  | $ | 386,324,594 |  |  | $ | 8,779,270 |  |  | $ | 382,358,608 |  |  | $ | 4,844,683 |
Bankrupt accounts |  |  | 615,499 |  |  |  | 2,367 |  |  |  | 408,059 |  |  |  | 6,182 |
Total |  | $ | 386,940,093 |  |  | $ | 8,781,637 |  |  | $ | 382,766,667 |  |  | $ | 4,850,865 |
Performing accounts |  | $ | 382,843,130 |  |  | $ | 8,746,338 |  |  | $ | 380,213,503 |  |  | $ | 4,833,310 |
Non-performing accounts |  |  | 4,096,963 |  |  |  | 35,299 |  |  |  | 2,553,164 |  |  |  | 17,555 |
Total |  | $ | 386,940,093 |  |  | $ | 8,781,637 |  |  | $ | 382,766,667 |  |  | $ | 4,850,865 |
Schedule of information regarding delinquency rates |
|  |  |  |  | Delinquencies |
Contracts |  | Gross Balance Outstanding |  |  | 30 – 59 days |  |  | 60 – 89 days |  |  | 90 + days |  |  | Total |
March 31, 2013 |  | $ | 386,940,093 |  |  | $ | 10,557,122 |  |  | $ | 2,723,456 |  |  | $ | 1,373,507 |  |  | $ | 14,654,085 |
|  |  |  |  |  |  | 2.73 | % |  |  | 0.70 | % |  |  | 0.35 | % |  |  | 3.78 | %
March 31, 2012 |  | $ | 382,766,667 |  |  | $ | 8,994,485 |  |  | $ | 1,889,643 |  |  | $ | 663,521 |  |  | $ | 11,547,649 |
|  |  |  |  |  |  | 2.35 | % |  |  | 0.49 | % |  |  | 0.17 | % |  |  | 3.01 | %
March 31, 2011 |  | $ | 368,099,418 |  |  | $ | 6,106,211 |  |  | $ | 1,468,079 |  |  | $ | 549,518 |  |  | $ | 8,123,808 |
|  |  |  |  |  |  | 1.66 | % |  |  | 0.40 | % |  |  | 0.15 | % |  |  | 2.21 | %
Direct Loans |  | Gross Balance Outstanding |  |  | 30 – 59 days |  |  | 60 – 89 days |  |  | 90 + days |  |  | Total |
March 31, 2013 |  | $ | 8,781,637 |  |  | $ | 72,364 |  |  | $ | 21,509 |  |  | $ | 13,790 |  |  | $ | 107,663 |
|  |  |  |  |  |  | 0.82 | % |  |  | 0.25 | % |  |  | 0.16 | % |  |  | 1.23 | %
March 31, 2012 |  | $ | 6,221,688 |  |  | $ | 48,899 |  |  | $ | 14,257 |  |  | $ | 4,933 |  |  | $ | 68,089 |
|  |  |  |  |  |  | 0.79 | % |  |  | 0.23 | % |  |  | 0.07 | % |  |  | 1.09 | %
March 31, 2011 |  | $ | 4,850,865 |  |  | $ | 37,399 |  |  | $ | 5,636 |  |  | $ | 11,919 |  |  | $ | 54,954 |
|  |  |  |  |  |  | 0.77 | % |  |  | 0.11 | % |  |  | 0.25 | % |  |  | 1.13 | %
Contracts |
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Schedule of finance receivables consisting of automobile finance installment contracts and direct loans |
|  | 2013 |  |  | 2012 |  |  | 2011 |
Indirect finance receivables, gross contract |  | $ | 386,940,093 |  |  | $ | 382,766,667 |  |  | $ | 368,099,418 |
Unearned interest |  |  | (111,121,493 | ) |  |  | (109,456,018 | ) |  |  | (105,622,007 | )
Indirect finance receivables, net of unearned interest |  |  | 275,818,600 |  |  |  | 273,310,649 |  |  |  | 262,477,411 |
Unearned dealer discounts |  |  | (16,415,169 | ) |  |  | (17,091,567 | ) |  |  | (17,024,119 | )
Indirect finance receivables, net of unearned interest and unearned dealer discounts |  |  | 259,403,431 |  |  |  | 256,219,082 |  |  |  | 245,453,292 |
Allowance for credit losses |  |  | (16,090,652 | ) |  |  | (19,499,208 | ) |  |  | (19,952,595 | )
Indirect finance receivables, net |  | $ | 243,312,779 |  |  | $ | 236,719,874 |  |  | $ | 225,500,697 |
Schedule of reconciliation of the changes in the allowance for credit losses |
|  | 2013 |  |  | 2012 |  |  | 2011 |
Balance at beginning of year |  | $ | 19,499,208 |  |  | $ | 19,952,595 |  |  | $ | 16,383,893 |
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 |  |  | $ | 19,952,595 |
Direct Loans |
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Schedule of finance receivables consisting of automobile finance installment contracts and direct loans |
|  | 2013 |  |  | 2012 |  |  | 2011 |
Direct finance receivables, gross contract |  | $ | 8,781,637 |  |  | $ | 6,221,688 |  |  | $ | 4,850,865 |
Unearned interest |  |  | (1,800,698 | ) |  |  | (1,195,948 | ) |  |  | (890,555 | )
Direct finance receivables, net of unearned interest |  |  | 6,980,939 |  |  |  | 5,025,740 |  |  |  | 3,960,310 |
Allowance for credit losses |  |  | (467,917 | ) |  |  | (492,184 | ) |  |  | (378,418 | )
Direct finance receivables, net |  | $ | 6,513,022 |  |  | $ | 4,533,556 |  |  | $ | 3,581,892 |
Schedule of reconciliation of the changes in the allowance for credit losses |
|  | 2013 |  |  | 2012 |  |  | 2011 |
Balance at beginning of year |  | $ | 492,184 |  |  | $ | 378,418 |  |  | $ | 382,869 |
Provision for credit losses |  |  | 139,493 |  |  |  | 182,062 |  |  |  | 125,937 |
Losses absorbed |  |  | (190,871 | ) |  |  | (93,041 | ) |  |  | (173,970 | )
Recoveries |  |  | 27,111 |  |  |  | 24,745 |  |  |  | 43,582 |
Balance at end of year |  | $ | 467,917 |  |  | $ | 492,184 |  |  | $ | 378,418 |

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- Definition Tabular disclosure of financing receivables (examples of financing receivables include loans, trade accounts receivable and notes receivable) and activity in the allowance for credit losses account. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953423-111524 + Details
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- Definition Tabular disclosure of financing receivables by credit quality indicator. The credit quality indicator is a statistic about the credit quality of financing receivables. Examples include, but not limited to, consumer credit risk scores, credit-rating-agency ratings, an entity's internal credit risk grades, loan-to-value ratios, collateral, collection experience and other internal metrics. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 29 -URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953659-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 55 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=7880640&loc=SL6953803-111525 + Details
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- Definition Tabular disclosure of the various types of trade accounts and notes receivable and for each the gross carrying value, allowance, and net carrying value as of the balance sheet date. Presentation is categorized by current, noncurrent and unclassified receivables. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3,4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 3, 4 -Article 5 + Details
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