Quarterly report pursuant to Section 13 or 15(d)

Debt - Convertible Debt (Details)

v3.8.0.1
Debt - Convertible Debt (Details) - USD ($)
3 Months Ended 9 Months Ended
May 23, 2016
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Jun. 29, 2015
Debt Instrument [Line Items]              
Repurchases of convertible debt $ 1,000,000     $ 0 $ 899,960    
7.00% Unsecured Convertible Senior Notes [Member]              
Debt Instrument [Line Items]              
Amount of underwriter's discount   $ 2,031,983   2,031,983   $ 2,586,166  
Convertible Debt [Member]              
Debt Instrument [Line Items]              
Interest expense   2,191,797 $ 2,214,097 6,575,391 6,609,045    
Discount Amortization   184,728 185,391 554,184 559,353    
Deferred Debt Issuance Amortization   12,069 $ 11,539 36,207 $ 36,497    
Amount of underwriter's discount   $ 3,700,000   $ 3,700,000      
Effective percentage   7.70% 7.80% 7.70% 7.70%    
Convertible Debt [Member] | 7.00% Unsecured Convertible Senior Notes [Member]              
Debt Instrument [Line Items]              
Total Commitment or Original Principal   $ 115,000,000   $ 115,000,000     $ 115,000,000.0
Coupon rate percentage   7.00%   7.00%   7.00% 7.00%
Interest expense   $ 1,995,000 $ 2,017,167 $ 5,985,000 $ 6,013,195