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Note 8 - Accounts Payable and Accrued Liabilities
12 Months Ended
Dec. 31, 2019
Notes to Financial Statements  
Accounts Payable and Accrued Liabilities Disclosure [Text Block]
8.
Accounts Payable and Accrued Liabilities
 
The following table sets forth the components of the Company’s accounts payable and accrued liabilities in the Consolidated Balance Sheets (in thousands):
 
   
December 31,
 
   
2019
   
2018
 
                 
Accrued production fees   $
1,946
    $
1,648
 
Accounts payable - trade
   
1,474
     
1,944
 
Accrued utilities and supplies    
645
     
344
 
Other accrued liabilities
   
1,613
     
960
 
                 
Total accounts payable and accrued liabilities
  $
5,678
    $
4,896