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Note 10 - Shareholders' Equity - Activity in Shareholders' Equity (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended 24 Months Ended
Dec. 31, 2017
Oct. 01, 2017
Jul. 02, 2017
Apr. 02, 2017
Jan. 01, 2017
Oct. 02, 2016
Jul. 03, 2016
Apr. 03, 2016
Dec. 31, 2017
Jan. 01, 2017
Jan. 03, 2016
Dec. 31, 2017
Balance       $ 340,729         $ 340,729      
Net income $ 4,322 [1] $ 19,439 $ 20,938 $ 8,547 [2] $ 4,707 [3] $ 15,904 $ 20,657 $ 12,894 53,246 $ 54,162 $ 72,418  
Pension liability adjustment                 (1,692) (11,572) 6,072  
Foreign currency translation adjustment                 31,579 (19,011) (32,575)  
Cash flow hedge unrealized gain (loss)                 904 0 $ 0  
Balance $ 330,091       $ 340,729       $ 330,091 $ 340,729   $ 330,091
Common Stock [Member]                        
Balance (in shares)       64,238,000       65,701,000 64,238,000 65,701,000 65,968,000 65,701,000
Balance       $ 6,424       $ 6,570 $ 6,424 $ 6,570 $ 6,597 $ 6,570
Net income                 $ 0 $ 0 $ 0  
Stock issuances under employee option plans (in shares)                 36,000 17,000 39,000  
Stock issuances under employee option plans                 $ 4 $ 2 $ 4  
Other issuances of common stock (in shares)                 253,000 277,000 597,000  
Other issuances of common stock                 $ 25 $ 28 $ 59  
Unamortized stock compensation expense related to restricted stock awards                 0 0 0  
Cash dividends paid                 $ 0 $ 0 $ 0  
Forfeitures and compensation expense related to stock awards (in shares)                 (93,000) (579,000) (253,000)  
Forfeitures and compensation expense related to stock awards                 $ (9) $ (58) $ (25)  
Share repurchases (in shares)                 (4,628,300) (1,177,600) (650,000)  
Share repurchases       (50,000)         $ (463) $ (118) $ (65)  
Pension liability adjustment                 0 0 0  
Foreign currency translation adjustment                 0 $ 0 $ 0  
Other (in shares)                   0 0  
Other                   $ 0 $ 0  
Windfall tax benefit - share-based payment awards                 0 $ 0    
Cash flow hedge unrealized gain (loss)                 0      
Adoption of new accounting standard - share-based payment awards                 $ 0      
Balance (in shares) 59,806,000       64,238,000       59,806,000 64,238,000 65,701,000 59,806,000
Balance $ 5,981       $ 6,424       $ 5,981 $ 6,424 $ 6,570 $ 5,981
Additional Paid-in Capital [Member]                        
Balance       359,451       370,327 359,451 370,327 368,603 370,327
Net income                 0 0 0  
Stock issuances under employee option plans                 508 251 355  
Other issuances of common stock                 4,507 4,726 9,746  
Unamortized stock compensation expense related to restricted stock awards                 (4,532) (4,754) (9,806)  
Cash dividends paid                 0 0 0  
Forfeitures and compensation expense related to stock awards                 5,574 979 14,670  
Share repurchases                 (91,113) (18,378) (13,241)  
Pension liability adjustment                 0 0 0  
Foreign currency translation adjustment                 0 0 0  
Other                   0 0  
Windfall tax benefit - share-based payment awards                 (3,124) 6,300    
Cash flow hedge unrealized gain (loss)                 0      
Adoption of new accounting standard - share-based payment awards                 0      
Balance 271,271       359,451       271,271 359,451 370,327 271,271
Retained Earnings [Member]                        
Balance       140,238       100,270 140,238 100,270 39,737 100,270
Net income                 53,246 54,162 72,418  
Stock issuances under employee option plans                 0 0 0  
Other issuances of common stock                 0 0 0  
Unamortized stock compensation expense related to restricted stock awards                 0 0 0  
Cash dividends paid                 (15,487) (14,285) (11,885)  
Forfeitures and compensation expense related to stock awards                 0 0 0  
Share repurchases                 0 0 0  
Pension liability adjustment                 0 0 0  
Foreign currency translation adjustment                 0 0 0  
Other                   91 0  
Windfall tax benefit - share-based payment awards                 0 0    
Cash flow hedge unrealized gain (loss)                 0      
Adoption of new accounting standard - share-based payment awards                 9,435      
Balance 187,432       140,238       187,432 140,238 100,270 187,432
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]                        
Balance       (54,862)       (43,290) (54,862) (43,290) (49,362) (43,290)
Net income                 0 0 0  
Stock issuances under employee option plans                 0 0 0  
Other issuances of common stock                 0 0 0  
Unamortized stock compensation expense related to restricted stock awards                 0 0 0  
Cash dividends paid                 0 0 0  
Forfeitures and compensation expense related to stock awards                 0 0 0  
Share repurchases                 0 0 0  
Pension liability adjustment                 (1,692) (11,572) 6,072  
Foreign currency translation adjustment                 0 0 0  
Other                   0 0  
Windfall tax benefit - share-based payment awards                 0 0    
Cash flow hedge unrealized gain (loss)                 0      
Adoption of new accounting standard - share-based payment awards                 0      
Balance (56,554)       (54,862)       (56,554) (54,862) (43,290) (56,554)
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]                        
Balance       (110,522)       $ (91,511) (110,522) (91,511) (58,936) (91,511)
Net income                 0 0 0  
Stock issuances under employee option plans                 0 0 0  
Other issuances of common stock                 0 0 0  
Unamortized stock compensation expense related to restricted stock awards                 0 0 0  
Cash dividends paid                 0 0 0  
Forfeitures and compensation expense related to stock awards                 0 0 0  
Share repurchases                 0 0 0  
Pension liability adjustment                 0 0 0  
Foreign currency translation adjustment                 31,579 (19,011) (32,575)  
Other                   0 0  
Windfall tax benefit - share-based payment awards                 0 0    
Cash flow hedge unrealized gain (loss)                 0      
Adoption of new accounting standard - share-based payment awards                 0      
Balance (78,943)       (110,522)       (78,943) (110,522) $ (91,511) (78,943)
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]                        
Balance       $ 0         0      
Net income                 0      
Stock issuances under employee option plans                 0      
Other issuances of common stock                 0      
Unamortized stock compensation expense related to restricted stock awards                 0      
Cash dividends paid                 0      
Forfeitures and compensation expense related to stock awards                 0      
Share repurchases                 0      
Pension liability adjustment                 0      
Foreign currency translation adjustment                 0      
Windfall tax benefit - share-based payment awards                 0      
Cash flow hedge unrealized gain (loss)                 904      
Adoption of new accounting standard - share-based payment awards                 0      
Balance $ 904       $ 0       $ 904 $ 0   $ 904
[1] Results for the fourth quarter of 2017 include tax charges of $15.2 million as a result of the recently enacted U.S. Tax Cuts and Jobs Act.
[2] Results for the first quarter of 2017 include restructuring and asset impairment charges of $7.3 million.
[3] Results for the fourth quarter of 2016 include restructuring and asset impairment charges of $19.8 million.