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Note 3 - Supplemental Balance Sheet Information (in Thousands) - Annual Amortization Expense (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
2021 $ 508  
2022 419  
2023 280  
2024 218  
2025 133  
Thereafter 697  
Total $ 2,255 $ 2,796