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Note 9 - Intangible Assets, Net - Future Amortization Expense (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
2021 $ 543  
2022 543  
2023 543  
2024 543  
2025 543  
thereafter 1,336  
Finite-Lived Intangible Assets, Net, Ending Balance $ 4,051 $ 4,081