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Note 3 - Supplemental Balance Sheet Information (in Thousands) - Annual Amortization Expense (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
2020 $ 533  
2021 533  
2022 508  
2023 419  
2024 280  
Thereafter 523  
Total $ 2,796 $ 3,332