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Note 7 - Investment and Equity Securities - Gains and Losses Recognized in Net Income on Equity Securities (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Net gains recognized in equity securities during the period $ 18  
Less: Net gains realized on the sale of equity securities during the period  
Unrealized gains recognized in equity securities held at reporting date [1] $ 18
[1] Not within scope of ASC 606.