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Note 1 - Organization and Significant Accounting Policies - Estimated Future Amortization Expense (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
2023 $ 60  
2024 52  
2025 31  
2026 31  
2027 31  
Thereafter 192  
Total $ 397 $ 448