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Note 8 - Accounts Payable and Accrued Liabilities (Tables)
9 Months Ended
Sep. 30, 2021
Notes Tables  
Schedule of Accounts Payable and Accrued Liabilities [Table Text Block]
  

September 30,

 

December 31,

 
  

2021

 

2020

 

 

       

Accounts payable - trade

 $10,876 $897 
RNG accrued project costs   4,396   
Accrued employee compensation  4,286  1,960 
Net-Zero 1 accrued project costs  2,914   

Other accrued liabilities

  2,110  1,086 
        

Total accounts payable and accrued liabilities

 $24,582 $3,943