Accounts Receivable, Short-Term and Long-Term Notes Receivable (Details 1) - USD ($)	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Accounts receivable
Incremental Provision	$ 35,211	$ 26,526
Allowance for accounts receivable, ending balance	1,820,000
Current [Member]
Notes receivable
Allowance for notes receivable, beginning balance	767,138
Incremental Provision	(10,378)
Recoveries	0
Charge offs	(7,122)
Allowance for notes receivable, ending balance	749,638
Accounts receivable
Allowance for accounts receivable, beginning balance	629,461
Incremental Provision	44,089
Recoveries	0
Charge offs	(4,089)
Allowance for accounts receivable, ending balance	669,461
Long-Term [Member]
Notes receivable
Allowance for notes receivable, beginning balance	399,401
Incremental Provision	1,500
Recoveries	0
Charge offs	0
Allowance for notes receivable, ending balance	$ 400,901