Note 8 - Components of Net Periodic Benefit Cost for Pension Plans (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Change in projected benefit obligation:
Projected benefit obligation at beginning of year	$ 108,006	$ 83,533
Service cost	3,130	5,162
Interest cost	4,159	4,106
Actuarial losses	420	16,712
Benefits paid	(1,683)	$ (1,507)
Effect of pension curtailment	(10,833)
Projected benefit obligation at end of year	103,199	$ 108,006
Change in plan assets:
Fair value of pension plan assets at beginning of year	66,813	58,063
Actual return on plan assets	(1,034)	3,940
Company contributions	5,150	6,317
Benefits paid	(1,683)	(1,507)
Fair value of pension plan assets at end of year	69,246	66,813
Funded status of pension plan	(33,953)	(41,193)
Amounts recognized in our balance sheets consist of:
Accrued benefit cost	(8,994)	(10,057)
Accumulated other comprehensive loss	(24,959)	(31,136)
Net liability recognized	$ (33,953)	$ (41,193)