Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies - Summary of Effects of Adopting Accounting Standards on Financial Statements (Details)

v3.10.0.1
Summary of Significant Accounting Policies - Summary of Effects of Adopting Accounting Standards on Financial Statements (Details) - USD ($)
Sep. 30, 2018
Jan. 31, 2018
Dec. 31, 2017
Summary Of Significant Accounting Policies [Line Items]      
Balance at December 31, 2017 As Previously Reported $ 37,603,687   $ 38,500,984
Balance at January 31, 2018 As Adjusted     38,500,984
Accumulated Other Comprehensive Income      
Summary Of Significant Accounting Policies [Line Items]      
Balance at December 31, 2017 As Previously Reported     796,603
Adjustment from financial instruments update ASU 2016-01     (796,603)
Accumulated Other Comprehensive Income | ASU 2016-01      
Summary Of Significant Accounting Policies [Line Items]      
Adjustment from financial instruments update ASU 2016-01   $ (796,603)  
Retained Earnings      
Summary Of Significant Accounting Policies [Line Items]      
Balance at December 31, 2017 As Previously Reported $ 3,591,588   3,746,323
Adjustment from financial instruments update ASU 2016-01     796,603
Balance at January 31, 2018 As Adjusted   4,542,926 4,542,926
Retained Earnings | ASU 2016-01      
Summary Of Significant Accounting Policies [Line Items]      
Adjustment from financial instruments update ASU 2016-01   796,603  
Investments in securities      
Summary Of Significant Accounting Policies [Line Items]      
Balance at December 31, 2017 As Previously Reported     $ 1,552,090
Investments in securities | ASU 2016-01      
Summary Of Significant Accounting Policies [Line Items]      
Adjustment from financial instruments update ASU 2016-01   (1,552,090)  
Marketable Equity Securities      
Summary Of Significant Accounting Policies [Line Items]      
Balance at January 31, 2018 As Adjusted   1,552,090  
Marketable Equity Securities | ASU 2016-01      
Summary Of Significant Accounting Policies [Line Items]      
Adjustment from financial instruments update ASU 2016-01   $ 1,552,090