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Note 7 - Capital Management - Components of Capital (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
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Statement Line Items [Line Items] |  |  |  |
Total equity | $ 69,211 | $ 59,317 | $ 50,361 | $ 50,343

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