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7. Debt (Tables)
6 Months Ended
Jun. 30, 2019
Debt Disclosure [Abstract]  
Schedule of debt
     June 30,      December 31,  
    2019     2018  
             
 5.50% Senior Unsecured Notes   $ 30,000,000     $ 30,000,000  
 Discount     (113,575 )     (129,796 )
 Issuance costs     (503,084 )     (574,953 )
 Long-term debt, net   $ 29,383,341     $ 29,295,251