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Note 1 - Organization and Significant Accounting Policies - Estimated Future Amortization Expense (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
2022 $ 57  
2023 57  
2024 49  
2025 28  
2026 28  
Thereafter 229  
Total $ 448 $ 553