Annual report pursuant to Section 13 and 15(d)

Notes and other obligations (Schedule of Long-Term Debt) (Details)

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Notes and other obligations (Schedule of Long-Term Debt) (Details) - USD ($)
Dec. 31, 2016
Dec. 31, 2015
Debt Disclosure [Abstract]    
Mortgage notes $ 1,997,701
Other short-term installment obligations 139,611 142,328
Notes and other obligations 139,611 2,140,029
Less current portion 139,611 301,250
Notes and other obligations, noncurrent $ 1,838,779