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Note 6 - Goodwill and Intangible Assets - Estimated Future Amortization Expense Related to Definite-Lived Intangible Assets (Details) - USD ($)
Dec. 31, 2016
Dec. 31, 2015
2017 $ 9,000  
2018 7,000  
2019 5,000  
2020 3,000  
2021 2,000  
Thereafter 8,000  
$ 34,000 $ 51,000