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Note 4 - Accounts Receivable (Tables)
3 Months Ended
Mar. 31, 2026
Notes Tables  
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]
  March 31, 2026  December 31, 2025 

Trade accounts receivable

 $1  $6 

Allowance for credit losses

      

Accounts receivable

 $1  $6