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Note 8 - Shareholders' Equity - Changes in Shareholders' Equity (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Apr. 01, 2017
Balance $ 927,556  
Net income 36,029 $ 38,891
Other comprehensive income (279)  
Stock-based compensation 8,714  
Withheld shares on restricted share units for withholding taxes (2,758)  
Stock options exercised 9,609  
Issuance of common stock(a) [1] 472,301  
Cash dividends paid ($0.37 per share) (9,198)  
Balance 1,441,974  
Parent [Member]    
Balance 927,419  
Net income 36,029  
Other comprehensive income (279)  
Stock-based compensation 8,714  
Withheld shares on restricted share units for withholding taxes (2,758)  
Stock options exercised 9,609  
Issuance of common stock(a) [1] 472,301  
Cash dividends paid ($0.37 per share) (9,198)  
Balance 1,441,837  
Noncontrolling Interest [Member]    
Balance 137  
Net income  
Other comprehensive income  
Stock-based compensation  
Withheld shares on restricted share units for withholding taxes  
Stock options exercised  
Issuance of common stock(a) [1]  
Cash dividends paid ($0.37 per share)  
Balance $ 137  
[1] The issuance of common stock (2,092,491 shares) during the three months ended March 31, 2018 relates to the acquisition of IXYS. See Note 2, Acquisitions for further discussion.