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Note 1 - Summary of Significant Accounting Policies (Details Textual) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Selling, General and Administrative Expense, Total $ 314,000 $ 357,200 $ 356,300
Cost of Goods and Services Sold, Total 593,200 675,900 678,500
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax, Ending Balance (19,100) (36,300) (31,900)
Restricted Cash and Cash Equivalents, Total 600 500  
Goodwill, Impairment Loss 0 0  
Goodwill, Ending Balance $ 207,800 195,100 182,700
Stock Repurchase Program, Number of Shares Authorized to be Repurchased (in shares) 1,392,892    
Advertising Expense $ 5,000 $ 8,200 $ 8,800
EMEA [Member]      
Goodwill, Ending Balance $ 168,800    
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount 7.00%    
Minimum [Member]      
Warranty Term (Year) 1 year    
Maximum [Member]      
Warranty Term (Year) 4 years    
Building and Building Improvements [Member]      
Property, Plant and Equipment, Useful Life (Year) 30 years    
Property, Plant and Equipment, Other Types [Member] | Minimum [Member]      
Property, Plant and Equipment, Useful Life (Year) 3 years    
Property, Plant and Equipment, Other Types [Member] | Maximum [Member]      
Property, Plant and Equipment, Useful Life (Year) 15 years    
Reclassification from Selling and Administrative Expense to Costs of Sales [Member]      
Selling, General and Administrative Expense, Total $ (5,000)    
Cost of Goods and Services Sold, Total $ 5,000