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Note 16 - Employee Benefit Plans (Details Textual)
 12 Months Ended
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
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%  
Defined Contribution Plan [Member]    
Defined Contribution Plan, Cost Recognized $ 930,000 $ 1,137,000
Non US Employees Defined Benefit Plan [Member]    
Defined Benefit Plan, Administration Expenses $ 30,000 26,000
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 $ (16,206,000)  
Defined Benefit Plan, Future Amortization of Gain (Loss) (697,000)  
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, Net of Tax $ 694,000 531,000
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay 3.00%  
Defined Contribution Plan, Cost Recognized $ 4,058,000 $ 4,967,000
Defined Contribution Plan, Number of Employees Covered 423 670