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

September 30,

   

December 31,

 
   

2024

   

2023

 

Prepaid insurance

  $ 1,196     $ 1,012  

Prepaid supplier expenses

    194       132  

Other receivables

    185       159  

Natural gas derivatives at fair value, current

    236        

Deposits

    129       237  

Other

    132       137  

Total prepaid expenses and other current assets

  $ 2,072     $ 1,677