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Note 5 - Prepaid Expenses and Other Current Assets (Tables)
12 Months Ended
Dec. 31, 2023
Notes Tables  
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Table Text Block]
  

December 31,

 
  

2023

  

2022

 

Prepaid insurance

 $1,012  $990 

Prepaid supplier expenses

  132   286 

Other receivables

  159   254 

Natural gas derivatives at fair value, current

     347 

Deposits

  237   236 

Other

  137   73 

Total prepaid expenses and other current assets

 $1,677  $2,186