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Note 8 - Retirement Plans - Matching Contributions (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Matching contributions to the Capital Accumulation Plan (in shares) 2,571 1,898 2,341
Matching contributions to the Capital Accumulation Plan $ 29 $ 26 $ 25