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Note 3 - Inventories (Tables)
6 Months Ended
Jun. 30, 2025
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   

June 30,

   

December 31,

 
   

2025

   

2024

 
   

(in thousands)

 

Natural gas

  $ 1,006     $ 1,333  

Renewable credits

    15,819       10,800  

Solar panels

    46       55  

Totals

  $ 16,871     $ 12,188