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Note 5 - Prepaid Expenses and Other Current Assets (Tables)
9 Months Ended
Sep. 30, 2023
Notes Tables  
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Table Text Block]
   

September 30,

   

December 31,

 
   

2023

   

2022

 

Prepaid insurance

  $ 1,354     $ 990  

Prepaid supplier expenses

    162       286  

Other receivables

    1,526       254  

Natural gas derivatives at fair value, current

    32       347  

Deposits

    203       236  

Other

    104       73  

Total prepaid expenses and other current assets

  $ 3,381     $ 2,186