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Note 3 - Intangible Assets and Goodwill - Future Amortization Expense (Details) - USD ($)
Dec. 31, 2019
Dec. 31, 2018
2020 $ 109,000  
2021 40,000  
2022 32,000  
2023 32,000  
2024 32,000  
Thereafter 79,000  
Total $ 324,000 $ 448,000