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Accounting Policies - Allowance for credit losses (Details) - USD ($)
6 Months Ended 12 Months Ended
Jun. 30, 2025
Dec. 31, 2025
Dec. 31, 2024
Accounts Receivable, Allowance for Credit Loss [Roll Forward]      
Balance $ 137,000 $ 137,000 $ 0
Provision for credit loss 24,000 24,000 108,000
Write-offs   (39,000)  
Acquired credit loss provision     29,000
Balance $ 122,000 $ 122,000 $ 137,000