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Basis of Presentation - Summary of change to consolidated statements of income (Details 1) (USD $)
 3 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Consolidated Statements of Income    
Interest and fee income on finance receivables $ 20,469,372 $ 20,417,957
Provision for credit losses 2,641,791 3,103,266
Operating income 9,265,473 8,789,217
Income tax expense 3,564,980 3,381,761
Net income 5,700,493 5,407,456
Earnings per share - basic (in dollars per share) $ 0.47 $ 0.45
Earnings per share - diluted (in dollars per share) $ 0.46 $ 0.44
Reported
    
Consolidated Statements of Income    
Interest and fee income on finance receivables   17,270,088
Provision for credit losses   10,372
Operating income   8,734,242
Income tax expense   3,360,717
Net income   5,373,525
Earnings per share - basic (in dollars per share)   $ 0.45
Earnings per share - diluted (in dollars per share)   $ 0.44
Correction
    
Consolidated Statements of Income    
Interest and fee income on finance receivables   3,147,869
Provision for credit losses   3,092,894
Operating income   54,975
Income tax expense   21,044
Net income   $ 33,931
Earnings per share - basic (in dollars per share)     
Earnings per share - diluted (in dollars per share)