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Basis of Presentation - Summary of change to consolidated statements of cash flows (operating activities) (Details 2) (USD $)
 3 Months Ended 6 Months Ended
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Consolidated Statements of Cash Flows (Operating Activities)      
Net income $ 5,150,138 $ 10,017,045 $ 10,557,594
Provision for credit losses 3,261,721 6,614,895 6,364,987
Deferred income taxes   1,215,453 628,705
Amortization of dealer discounts   (6,108,055) (6,082,112)
Net cash provided by operating activities   10,771,698 12,736,379
Reported
      
Consolidated Statements of Cash Flows (Operating Activities)      
Net income 5,161,950   10,535,475
Provision for credit losses 308,340   318,712
Deferred income taxes     614,987
Amortization of dealer discounts       
Net cash provided by operating activities     12,736,379
Correction
      
Consolidated Statements of Cash Flows (Operating Activities)      
Net income (11,812)   22,119
Provision for credit losses 2,953,381   6,046,275
Deferred income taxes     13,718
Amortization of dealer discounts     (6,082,112)
Net cash provided by operating activities