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Note 7 - Pensions and Other Postretirement Benefits - Amounts Recognized in the Company's Consolidated Balance Sheets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Change in plan assets:      
Plan assets at beginning of year $ 83,318    
Plan assets at end of year 80,802 $ 83,318  
Noncurrent assets 4,313 6,211  
Pension Plan [Member]      
Accumulated benefit obligation at end of year 63,173 64,033  
Benefit obligation at beginning of year 77,107 77,600  
Service cost 2,727 2,837 $ 3,064
Interest cost 2,537 2,643 2,640
Plan Changes  
Settlement 1,398  
Benefits paid (12,066) (5,510)  
Effect of foreign exchange  
Actuarial loss (gain) 4,786 (463)  
Benefit obligation at end of year 76,489 77,107 77,600
Change in plan assets:      
Plan assets at beginning of year 83,318 68,291  
Actual return on plan assets 7,550 4,537  
Employer contributions 2,000 16,000  
Benefits paid (12,066) (5,510)  
Plan assets at end of year 80,802 83,318 68,291
Funded status at end of year 4,313 6,211  
Noncurrent assets 4,313 6,211  
Current liabilities  
Noncurrent liabilities  
Total assets (liabilities) 4,313 6,211  
Net actuarial loss (gain) 24,571 27,041  
Prior Service Cost  
Deferred tax (benefit) expense (9,223) (10,506)  
After tax actuarial loss (gain) 15,348 16,535  
Postretirement Plan [Member]      
Accumulated benefit obligation at end of year 17,367 22,340  
Benefit obligation at beginning of year 22,340 22,430  
Service cost 1,249 1,192 1,194
Interest cost 814 842 790
Plan Changes (6,646)  
Settlement  
Benefits paid (2,278) (1,637)  
Effect of foreign exchange 24 7  
Actuarial loss (gain) 1,864 (494)  
Benefit obligation at end of year 17,367 22,340 22,430
Change in plan assets:      
Plan assets at beginning of year  
Actual return on plan assets  
Employer contributions 2,278 1,637  
Benefits paid (2,278) (1,637)  
Plan assets at end of year
Funded status at end of year (17,367) (22,340)  
Noncurrent assets  
Current liabilities (1,630) (1,631)  
Noncurrent liabilities (15,737) (20,709)  
Total assets (liabilities) (17,367) (22,340)  
Net actuarial loss (gain) (5,377) (7,890)  
Prior Service Cost (6,646)  
Deferred tax (benefit) expense 3,683 2,978  
After tax actuarial loss (gain) $ (8,340) $ (4,912)