Accounts Receivable, Short-Term and Long-Term Notes Receivable (Details) - USD ($)	Sep. 30, 2015	Dec. 31, 2014
Accounts Receivable
Accounts receivable, reserve	$ 932,934
Current [Member]
Customer Notes Receivable
Gross notes receivable	739,788	$ 760,417
Notes receivable reserve	290,369	286,571
Net notes receivable	449,419	473,846
Accounts Receivable
Accounts receivable, gross	793,830	344,313
Accounts receivable, reserve	272,188	188,527
Accounts receivable, net	521,642	155,786
Long-Term [Member]
Customer Notes Receivable
Gross notes receivable	822,319	1,028,805
Notes receivable reserve	370,377	349,954
Net notes receivable	$ 451,942	$ 678,851
Accounts Receivable
Accounts receivable, gross
Accounts receivable, reserve
Accounts receivable, net