Accounts Receivable, Short-Term and Long-Term Notes Receivable (Details 1) - USD ($)	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Incremental Provision	$ 26,526	$ 148,962
Allowance for accounts receivable, ending balance	1,392,630
Current [Member]
Allowance for notes receivable, beginning balance	632,422
Incremental Provision	116,417
Recoveries	$ (23,779)
Charge offs
Allowance for notes receivable, ending balance	$ 748,839
Allowance for accounts receivable, beginning balance	295,759
Incremental Provision	26,526
Recoveries	0
Charge offs	23,779
Allowance for accounts receivable, ending balance	298,506
Long-Term [Member]
Allowance for notes receivable, beginning balance	461,702
Incremental Provision	(116,497)
Recoveries	0
Charge offs	0
Allowance for notes receivable, ending balance	345,285
Allowance for accounts receivable, beginning balance	0
Charge offs	0
Allowance for accounts receivable, ending balance	$ 0