Accounts Receivable, Short-Term and Long-Term Notes Receivable (Details 1) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Incremental Provision	$ 878,472	$ 69,445	$ 1,313,349	$ 199,087
Allowance for accounts receivable, ending balance	932,934		932,934
Current [Member]
Allowance for notes receivable, beginning balance			286,571
Incremental Provision			358,450
Charge offs			(354,652)
Allowance for notes receivable, ending balance	290,369		290,369
Allowance for accounts receivable, beginning balance			188,527
Incremental Provision			418,056
Charge offs			(334,395)
Allowance for accounts receivable, ending balance	272,188		272,188
Long-Term [Member]
Allowance for notes receivable, beginning balance			349,954
Incremental Provision			364,370
Charge offs			(343,947)
Allowance for notes receivable, ending balance	$ 370,377		$ 370,377
Allowance for accounts receivable, beginning balance
Incremental Provision
Charge offs
Allowance for accounts receivable, ending balance