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Basis of Presentation - Summary of change to consolidated statements of cash flows (operating activities) (Details 2) (USD $)
 3 Months Ended 9 Months Ended
Dec. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Consolidated Statements of Cash Flows (Operating Activities)      
Net income $ 4,596,056 $ 13,843,813 $ 15,153,650
Provision for credit losses 3,484,811 10,797,930 9,849,798
Deferred income taxes   1,378,601 900,165
Amortization of dealer discounts   (9,911,725) (8,797,978)
Net cash provided by operating activities   15,818,515 16,701,812
Reported
      
Consolidated Statements of Cash Flows (Operating Activities)      
Net income 4,565,220   15,100,695
Provision for credit losses 818,903   1,137,615
Deferred income taxes     867,325
Amortization of dealer discounts       
Net cash provided by operating activities     16,701,812
Correction
      
Consolidated Statements of Cash Flows (Operating Activities)      
Net income 30,836   52,955
Provision for credit losses 2,665,908   8,712,183
Deferred income taxes     32,840
Amortization of dealer discounts     (8,797,978)
Net cash provided by operating activities