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Note 8 - Related Party Transactions (Tables)
6 Months Ended
Jun. 30, 2023
Notes Tables  
Schedule of Related Party Transactions [Table Text Block]
  

June 30,

  

December 31,

 
  

2023

  

2022

 

Loans from joint venture partners(1):

        

China

 $1,554  $1,382 

Mexico

  623   623 

Australia

  636   693 

Resource Plus

  266   266 

Total due to affiliates

 $3,079  $2,964