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Summary of Significant Accounting Policies - Summary of change to consolidated statements of income (Details 1) (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
Consolidated Statements of Income |  |  |  |  |  |  |  |  |  |  |
Interest and fee income on finance receivables |  |  |  |  |  |  |  |  | $ 82,072,643 | $ 80,470,980 | $ 73,661,457
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
Income tax expense | 3,046,179 | 2,878,811 | 3,238,458 | 3,381,761 | 3,749,890 | 3,340,762 | 3,504,456 | 3,331,408 | 12,545,209 | 13,926,516 | 10,518,740
Operating income | 7,833,475 | 7,474,867 | 8,388,596 | 8,789,217 | 9,751,883 | 8,719,605 | 9,036,821 | 8,639,966 | 32,486,155 | 36,148,275 | 27,287,034
Net income | 4,787,296 | 4,596,056 | 5,150,138 | 5,407,456 | 6,001,993 | 5,378,843 | 5,532,365 | 5,308,558 | 19,940,946 | 22,221,759 | 16,768,294
Earnings per share - basic (in dollars per share) | $ 0.40 | $ 0.38 | $ 0.43 | $ 0.45 | $ 0.51 | $ 0.46 | $ 0.47 | $ 0.46 | $ 1.66 | $ 1.89 | $ 1.44
Earnings per share - diluted (in dollars per share) | $ 0.39 | $ 0.38 | $ 0.42 | $ 0.44 | $ 0.50 | $ 0.45 | $ 0.46 | $ 0.44 | $ 1.63 | $ 1.85 | $ 1.41
Reported |  |  |  |  |  |  |  |  |  |  |
Consolidated Statements of Income |  |  |  |  |  |  |  |  |  |  |
Interest and fee income on finance receivables |  |  |  |  |  |  |  |  |  | 68,122,532 | 62,719,904
Provision for credit losses |  |  |  |  |  |  |  |  |  | 5,319 | 4,610,221
Income tax expense |  |  |  |  |  |  |  |  |  | 13,931,809 | 10,541,620
Operating income |  |  |  |  |  |  |  |  |  | 36,162,101 | 27,346,804
Net income |  |  |  |  |  |  |  |  |  | 22,230,292 | 16,805,184
Earnings per share - basic (in dollars per share) |  |  |  |  |  |  |  |  |  | $ 1.89 | $ 1.45
Earnings per share - diluted (in dollars per share) |  |  |  |  |  |  |  |  |  | $ 1.85 | $ 1.41
Correction |  |  |  |  |  |  |  |  |  |  |
Consolidated Statements of Income |  |  |  |  |  |  |  |  |  |  |
Interest and fee income on finance receivables |  |  |  |  |  |  |  |  |  | 12,348,448 | 10,941,553
Provision for credit losses |  |  |  |  |  |  |  |  |  | 12,362,274 | 11,001,323
Income tax expense |  |  |  |  |  |  |  |  |  | (5,293) | (22,880)
Operating income |  |  |  |  |  |  |  |  |  | (13,826) | (59,770)
Net income |  |  |  |  |  |  |  |  |  | $ (8,533) | $ (36,890)
Earnings per share - basic (in dollars per share) |  |  |  |  |  |  |  |  |  |  | $ (0.01)
Earnings per share - diluted (in dollars per share) |  |  |  |  |  |  |  |  |  |  |

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