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Note 1 - Organization and Significant Accounting Policies - Estimated Future Amortization Expense (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
2021 $ 145  
2022 52  
2023 51  
2024 44  
2025 43  
Thereafter 218  
Total $ 553 $ 906