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7. Debt (Tables)
3 Months Ended
Mar. 31, 2019
Debt Disclosure [Abstract]  
Schedule of Debt
    March 31,     December 31,  
    2019     2018  
             
5.50% Senior Unsecured Notes   $ 30,000,000     $ 30,000,000  
Discount     (121,656 )     (129,796 )
Issuance costs     (539,048 )     (574,953 )
Long-term debt, net   $ 29,339,296     $ 29,295,251