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Note 14 - Benefit Plans - Accumulated Benefit Obligation (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Accumulated benefit obligation at end of period $ 72,631 $ 65,956  
Projected benefit obligation at beginning of period 65,956 63,894  
Interest cost 2,688 2,747 $ 2,681
Net actuarial loss 6,170 1,363  
Benefits paid (2,183) (2,048)  
Projected benefit obligation at end of period 72,631 65,956 63,894
Fair value of plan assets at beginning of period 46,488 43,985  
Actual return on plan assets 8,382 3,820  
Company contributions 5,327 731  
Benefits paid (2,183) (2,048)  
Fair value of plan assets at end of period 58,014 46,488 $ 43,985
Funded status: accrued pension liability included in other long-term liabilities (14,617) (19,468)  
Net actuarial loss, net of tax $ (10,978) $ (11,040)