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Note 6 - Goodwill and Intangible Assets - Estimated Future Amortization Expense Related to Definite-lived Intangible Assets (Details) - USD ($)
Dec. 31, 2018
Dec. 31, 2017
2019 $ 4,000  
2020 3,000  
2021 2,000  
2022 2,000  
2023 2,000  
Thereafter 3,000  
$ 16,000 $ 21,000