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Fair Value (Details) - USD ($)
12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2014
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Average loan life 8 months      
Cash and cash equivalents $ 32,086,304 $ 15,200,410 $ 12,377,024 $ 38,338,935
Loans and Leases Receivable, Net Amount 725,180,728 695,700,589    
Book value of debt [Abstract]        
Senior notes payable 244,900,000 295,136,200    
Total long-term debt 244,900,000      
Book value [Member] | Senior notes payable [Member]        
Book value of debt [Abstract]        
Senior notes payable 244,900,000 295,136,200    
Estimate of Fair Value Measurement [Member] | Senior notes payable [Member]        
Book value of debt [Abstract]        
Senior notes payable 244,900,000 295,136,200    
Fair Value, Inputs, Level 1 [Member] | Book value [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and Cash Equivalents, Fair Value Disclosure 32,086,304 15,200,410    
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value Measurement [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and Cash Equivalents, Fair Value Disclosure 32,086,304 15,200,410    
Fair Value, Inputs, Level 3 [Member] | Book value [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Receivables, Fair Value Disclosure 725,180,728 695,700,589    
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value Measurement [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Receivables, Fair Value Disclosure $ 725,180,728 $ 695,700,589