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Note 3 - Balance Sheet Components - Annual Amortization of Identifiable Intangible Assets (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
2020 (remaining nine months) $ 952  
2021 1,093  
2022 886  
2023 886  
2024 747  
2025 and thereafter 1,340  
Total future amortization expense $ 5,904 $ 6,221