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16. Derivative Financial Instruments (Tables)
3 Months Ended
Mar. 31, 2019
Notes to Financial Statements  
Schedule of warrant activity
   Number of Shares   Weighted Average Exercise Price 
Warrants outstanding as of December 31, 2018   6,000   $1.00 
Warrants issued in connection with convertible debenture offering (see Note 10):          
Issued to convertible debenture holders   88,171   $3.00 
Issued to 4Front as part of compensation      $2.41 
Warrants exercised        
Warrants expired        
Warrants outstanding as of March 31, 2019   94,171   $2.87