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Consolidated Statements of Equity (Parentheticals) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Retained Earnings [Member] |  |  |
Cash dividend declared, per share (in dollars per share) | $ 0.41 | $ 0.52 | $ 0.26
Amortization of unrealized gains, tax | $ 46 | $ 57 | $ 73
Cash dividend declared, per share (in dollars per share) | $ 0.41 | $ 0.52 | $ 0.26

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