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Note 4 - Prepaid Expenses and Other Current Assets (Tables)
6 Months Ended
Jun. 30, 2024
Notes Tables  
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Table Text Block]
   

June 30,

   

December 31,

 
   

2024

   

2023

 

Prepaid insurance

  $ 330     $ 1,012  

Prepaid supplier expenses

    112       132  

Other receivables

    284       159  

Natural gas derivatives at fair value, current

    329        

Deposits

    125       237  

Other

    145       137  

Total prepaid expenses and other current assets

  $ 1,325     $ 1,677