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Note 3 - Prepaid Expenses and Other Current Assets (Tables)
6 Months Ended
Jun. 30, 2025
Notes Tables  
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Table Text Block]
  

June 30,

  

December 31,

 
  

2025

  

2024

 

Prepaid insurance

 $294  $1,044 

Prepaid supplier expenses

  289   167 

Other receivables

  217   204 

Natural gas derivatives at fair value, current

     207 

Deposits

  99   129 

Other

  140   151 

Total prepaid expenses and other current assets

 $1,039  $1,902