Note 6 - Accrued Retirement Benefits - Net Periodic Cost (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Interest cost	$ 2,804	$ 2,753
Expected return on plan assets	(2,713)	(3,306)
Recognized net actuarial loss	1,030	843
Settlement/Curtailment Expense	3,958
Pension expense	5,079	290
Net (gain) loss	(1,384)	3,986
Recognized loss	(4,988)	(893)
Total recognized (gain) loss in comprehensive income	$ (6,372)	$ 3,093