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6. Investments (Tables) (June 2019)
 6 Months Ended
Jun. 30, 2019
Investments, Debt and Equity Securities [Abstract]  
Cost Method Investments
   June 30,   December 31, 
   2019   2018 
Investment in Edyza, cost method  $922,884   $812,883 
Investment in TGH, equity method   815,765    – 
Investment in TGH, cost method   –    448,766 
   $1,738,649   $1,261,649