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Note 6 - Retirement Plans - Components of Net Periodic Benefit Cost for Pension Plans (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Interest cost $ 1,106 $ 1,528 $ 2,212 $ 2,335
Expected return on plan assets (1,536) (1,848) (3,072) (2,824)
Loss amortization 169 158 339 242
Net periodic income, net $ (261) $ (162) $ (521) $ (247)