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Note 3 - Trade Accounts Receivable (Details Textual) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Deferred Discounts, Finance Charges and Interest Included in Receivables   $ 0
Accounts Receivable, Noncurrent, Accrued Interest, after Allowance for Credit Loss   0
Accounts Receivable, Allowance for Credit Loss, Current $ 0 0
Accounts Receivable, Allowance for Credit Loss, Writeoff 0 0
Accounts Receivable, Allowance for Credit Loss, Recovery 0 $ 0
Financial Asset, Past Due [Member]    
Deferred Discounts, Finance Charges and Interest Included in Receivables 0  
Accounts Receivable, Noncurrent, Accrued Interest, after Allowance for Credit Loss $ 0