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Note 6 - Goodwill and Intangible Assets - Future Amortization Expense (Details) - USD ($)
Mar. 31, 2020
Dec. 31, 2019
2020 (9 months remaining) $ 2,100  
2021 2,825,000  
2022 2,825,000  
2023 2,795,000  
2024 2,770,000  
Thereafter 7,979,000  
Total $ 21,294,000 $ 21,982,000