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Note 16 - Employee Benefit Plans (Details Textual) - USD ($)
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Defined Benefit Plan Highest Average Compensation Period 5 years  
Defined Benefit Plan Maximum Period Allocated for Calculating Average Compensation 10 years  
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss), Net Actuarial Gain (Loss), before Tax $ (15,675,000)  
Defined Benefit Plan, Future Amortization of Gain (Loss) (705,000)  
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, Net of Tax 664,000 $ 694,000
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay   3.00%
Defined Contribution Plan, Cost Recognized $ 2,502,000 $ 4,058,000
Defined Contribution Plan, Number of Employees Covered 368 423
Defined Contribution Plan [Member]    
Defined Contribution Plan, Cost Recognized $ 668,000 $ 930,000
Non US Employees Defined Benefit Plan [Member]    
Defined Benefit Plan, Administration Expenses $ 11,000 $ 30,000
Equity Securities [Member]    
Defined Benefit Plan, Target Plan Asset Allocations Range Minimum 0.00%  
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum 55.00%  
Fixed Income Securities [Member]    
Defined Benefit Plan, Target Plan Asset Allocations Range Minimum 35.00%  
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum 100.00%  
Non Traditional Securities [Member]    
Defined Benefit Plan, Target Plan Asset Allocations Range Minimum 0.00%  
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum 10.00%