Note 8 - Accrued Retirement Benefits - Net Periodic Cost (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Interest cost	$ 691	$ 780	$ 2,073	$ 2,324
Expected return on plan assets	(826)	(933)	(2,478)	(2,487)
Recognized actuarial loss	211	163	634	455
Pension and other postretirement expenses	$ 76	$ 10	$ 229	$ 292