Accounts Receivable, Short-Term and Long-Term Notes Receivable (Details 1) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Incremental Provision	$ 36,266	$ 285,913	$ 62,792	$ 434,877
Allowance for accounts receivable, ending balance	1,414,111		1,414,111
Current [Member]
Allowance for notes receivable, beginning balance			632,422
Incremental Provision			120,273
Recoveries			(39,364)
Charge offs			0
Allowance for notes receivable, ending balance	752,695		752,695
Allowance for accounts receivable, beginning balance			295,759
Incremental Provision			63,610
Recoveries			800
Charge offs			(39,364)
Allowance for accounts receivable, ending balance	320,805		320,805
Long-Term [Member]
Allowance for notes receivable, beginning balance			461,702
Incremental Provision			(121,091)
Recoveries			0
Charge offs			0
Allowance for notes receivable, ending balance	340,611		340,611
Allowance for accounts receivable, beginning balance			0
Incremental Provision			0
Recoveries			0
Charge offs			0
Allowance for accounts receivable, ending balance	$ 0		$ 0