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Note 4 - Intangible Assets - Summary of Estimated Amortization Expense (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Remainder of 2020 $ 1,143  
2021 1,153  
2022 1,153  
2023 1,153  
2024 1,015  
Thereafter 5,807  
Total amortization expense $ 11,424 $ 1,231