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Note 8 - Net Periodic Cost (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Interest cost $ 708 $ 691 $ 1,415 $ 1,382
Expected return on plan assets (677) (826) (1,355) (1,652)
Recognized actuarial loss 253 211 507 422
Pension and other postretirement expenses $ 284 $ 76 $ 567 $ 152