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Basis of Presentation - Summary of change to consolidated statements of cash flows (operating activities) (Details 2) (USD $)
 3 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Consolidated Statements of Cash Flows (Operating Activities)    
Net income $ 5,700,493 $ 5,407,456
Provision for credit losses 2,641,791 3,103,266
Deferred income taxes 858,193 (253,697)
Amortization of dealer discounts (2,974,446) (3,147,869)
Net cash provided by operating activities 7,688,869 8,939,029
Reported
    
Consolidated Statements of Cash Flows (Operating Activities)    
Net income   5,373,525
Provision for credit losses   10,372
Deferred income taxes   (274,741)
Amortization of dealer discounts     
Net cash provided by operating activities   8,939,029
Correction
    
Consolidated Statements of Cash Flows (Operating Activities)    
Net income   33,931
Provision for credit losses   3,092,894
Deferred income taxes   21,044
Amortization of dealer discounts   (3,147,869)
Net cash provided by operating activities