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Note 6 - Accrued Retirement Benefits - Net Periodic Cost (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Pension and other benefits:    
Interest cost $ 2,216 $ 2,804
Expected return on plan assets (2,255) (2,713)
Recognized net actuarial loss 840 1,030
Settlement/Curtailment Expense 3,958
Pension expense 801 5,079
Other changes in plan assets and benefit obligations recognized in comprehensive income:    
Net gain (1,201) (1,384)
Recognized gain (840) (4,988)
Total recognized gain in comprehensive income $ (2,041) $ (6,372)