Finance Receivables - Information regarding delinquency rates with respect to contracts and direct loans (Details 4) - Finance receivables - USD ($)	Dec. 31, 2015	Dec. 31, 2014
Contracts
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross Balance Outstanding	$ 478,397,403	$ 431,877,085
Total	$ 35,082,524	$ 31,034,449
Total (in percentage)	7.33%	7.19%
Contracts | 31 - 60 days
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross Balance Outstanding	$ 23,970,608	$ 21,749,891
Total (in percentage)	5.01%	5.04%
Contracts | 61 - 90 days
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross Balance Outstanding	$ 7,029,791	$ 6,103,607
Total (in percentage)	1.47%	1.41%
Contracts | Over 90 days
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross Balance Outstanding	$ 4,082,125	$ 3,180,951
Total (in percentage)	0.85%	0.74%
Direct Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross Balance Outstanding	$ 12,032,334	$ 11,680,909
Total	$ 312,314	$ 270,166
Total (in percentage)	2.60%	2.31%
Direct Loans | 31 - 60 days
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross Balance Outstanding	$ 211,921	$ 164,347
Total (in percentage)	1.76%	1.40%
Direct Loans | 61 - 90 days
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross Balance Outstanding	$ 63,543	$ 59,043
Total (in percentage)	0.53%	0.51%
Direct Loans | Over 90 days
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross Balance Outstanding	$ 36,850	$ 46,776
Total (in percentage)	0.31%	0.40%