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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
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)