Note 14 - Benefit Plans - Accumulated Benefit Obligation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Accumulated benefit obligation at end of period	$ 65,956	$ 63,894
Projected benefit obligation at beginning of period	63,894	68,376
Interest cost	2,747	2,681	$ 2,591
Net actuarial loss (gain)	1,363	(5,254)
Benefits paid	(2,048)	(1,909)
Projected benefit obligation at end of period	65,956	63,894	68,376
Fair value of plan assets at beginning of period	43,985	45,452
Actual return (loss) on plan assets	3,820	(384)
Company contributions	731	826
Benefits paid	(2,048)	(1,909)
Fair value of plan assets at end of period	46,488	43,985	$ 45,452
Funded status: accrued pension liability included in other long-term liabilities	(19,468)	(19,909)
Net actuarial loss, net of tax	$ (11,040)	$ (11,362)