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Note 6 - Goodwill and Intangible Assets - Estimated Amortization Expense (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
2018 $ 1,194 $ 1,194
2020 1,107  
2021 985  
2022 985  
2023 985  
Thereafter 575  
Total estimated amortization expense $ 4,637