Quarterly report pursuant to Section 13 or 15(d)

Fair Value - Carrying and Fair Value Amounts (Details)

v3.5.0.2
Fair Value - Carrying and Fair Value Amounts (Details) - USD ($)
Sep. 30, 2016
Dec. 31, 2015
Carrying Amount [Member] | Level 1 [Member]    
Financial Assets:    
Cash and cash equivalents $ 10,107,754 $ 14,618,740
Carrying Amount [Member] | Level 2 [Member]    
Financial Assets:    
Escrow receivable 0 1,392,917
Derivative asset 0 98,259
Financial Liabilities:    
Long-term debt 91,698,387 105,440,842
Unsecured convertible senior notes 111,048,098 111,423,910
Derivative liability 49,143 0
Carrying Amount [Member] | Level 3 [Member]    
Financial Assets:    
Financing notes receivable 1,500,000 7,675,626
Fair Value [Member] | Level 1 [Member]    
Financial Assets:    
Cash and cash equivalents 10,107,754 14,618,740
Fair Value [Member] | Level 2 [Member]    
Financial Assets:    
Escrow receivable 0 1,392,917
Derivative asset 0 98,259
Financial Liabilities:    
Long-term debt 91,698,387 105,440,842
Unsecured convertible senior notes 112,860,000 87,622,591
Derivative liability 49,143 0
Fair Value [Member] | Level 3 [Member]    
Financial Assets:    
Financing notes receivable $ 1,500,000 $ 7,675,626