Quarterly report pursuant to Section 13 or 15(d)

Fair Value - Carrying and Fair Value Amounts (Details)

v3.8.0.1
Fair Value - Carrying and Fair Value Amounts (Details) - USD ($)
Mar. 31, 2018
Dec. 31, 2017
Carrying Amount [Member] | Level 1 [Member]    
Financial Assets:    
Cash and cash equivalents $ 17,330,097 $ 15,787,069
Financial Liabilities:    
Unsecured convertible senior notes 112,228,880 112,032,083
Carrying Amount [Member] | Level 2 [Member]    
Financial Liabilities:    
Secured Credit Facilities 39,867,493 40,745,354
Carrying Amount [Member] | Level 3 [Member]    
Financial Assets:    
Financing notes receivable 1,000,000 1,500,000
Fair Value [Member] | Level 1 [Member]    
Financial Assets:    
Cash and cash equivalents 17,330,097 15,787,069
Financial Liabilities:    
Unsecured convertible senior notes 135,421,740 139,101,660
Fair Value [Member] | Level 2 [Member]    
Financial Liabilities:    
Secured Credit Facilities 39,867,493 40,745,354
Fair Value [Member] | Level 3 [Member]    
Financial Assets:    
Financing notes receivable $ 1,000,000 $ 1,500,000