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Note 1 - Summary of Significant Accounting Policies - Estimated Future Amortization of Intangible Assets (Details) - USD ($)
Dec. 31, 2017
Dec. 31, 2016
2018 $ 58,000  
2019 46,000  
2020 38,000  
2021 38,000  
2022 38,000  
Thereafter 68,000  
$ 286,000 $ 359,000