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Note 12 - Shareholders' Equity - Activity in Shareholders' Equity (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 30, 2018
Sep. 30, 2018
 [2]
Jul. 01, 2018
 [3]
Apr. 01, 2018
Dec. 31, 2017
Oct. 01, 2017
Jul. 02, 2017
Apr. 02, 2017
Dec. 30, 2018
Dec. 31, 2017
Jan. 01, 2017
Balance       $ 330,091         $ 330,091    
Net income $ 6,395 [1] $ 8,172 $ 20,602 $ 15,084 $ 4,322 [4] $ 19,439 $ 20,938 $ 8,547 [5] 50,253 $ 53,246 $ 54,162
Pension liability adjustment                 12,944 (1,692) (11,572)
Foreign currency translation adjustment                 (22,544) 31,579 (19,011)
Cash flow hedge unrealized gain (loss)                 422 904 $ 0
Balance $ 354,663       $ 330,091       $ 354,663 $ 330,091  
Common Stock [Member]                      
Balance (in shares)       59,806,000       64,238,000 59,806,000 64,238,000 65,701,000
Balance       $ 5,981       $ 6,424 $ 5,981 $ 6,424 $ 6,570
Net income                 $ 0 $ 0 $ 0
Stock issuances under employee plans (in shares)                 224,000 36,000 17,000
Stock issuances under employee plans                 $ 22 $ 4 $ 2
Other issuances of common stock (in shares)                 182,000 253,000 277,000
Other issuances of common stock                 $ 18 $ 25 $ 28
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)                 (89,000) (93,000) (579,000)
Forfeitures and compensation expense related to stock awards                 $ (9) $ (9) $ (58)
Share Repurchases (in shares)                 (615,000) (4,628,300) (1,177,600)
Share Repurchases               (50,000) $ (61) $ (463) $ (118)
Pension liability adjustment                 0 0 0
Foreign currency translation adjustment                 0 0 0
Windfall tax benefit - share-based payment awards                   0 0
Other                     $ 0
Cash flow hedge unrealized gain (loss)                 $ 0 0  
Adoption of new accounting standard - share-based payment awards                   $ 0  
Balance (in shares) 59,508,000       59,806,000       59,508,000 59,806,000 64,238,000
Balance $ 5,951       $ 5,981       $ 5,951 $ 5,981 $ 6,424
Additional Paid-in Capital [Member]                      
Balance       271,271       359,451 271,271 359,451 370,327
Net income                 0 0 0
Stock issuances under employee plans                 476 508 251
Other issuances of common stock                 4,809 4,507 4,726
Unamortized stock compensation expense related to restricted stock awards                 (4,710) (4,532) (4,754)
Cash dividends paid                 0 0 0
Forfeitures and compensation expense related to stock awards                 12,847 5,574 979
Share Repurchases                 (14,424) (91,113) (18,378)
Pension liability adjustment                 0 0 0
Foreign currency translation adjustment                 0 0 0
Windfall tax benefit - share-based payment awards                   (3,124) 6,300
Other                     0
Cash flow hedge unrealized gain (loss)                 0 0  
Adoption of new accounting standard - share-based payment awards                   0  
Balance 270,269       271,271       270,269 271,271 359,451
Retained Earnings [Member]                      
Balance       187,432       140,238 187,432 140,238 100,270
Net income                 50,253 53,246 54,162
Stock issuances under employee 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                 (15,471) (15,487) (14,285)
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
Windfall tax benefit - share-based payment awards                   0 0
Other                     91
Cash flow hedge unrealized gain (loss)                 0 0  
Adoption of new accounting standard - share-based payment awards                   9,435  
Balance 222,214       187,432       222,214 187,432 140,238
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]                      
Balance       (56,554)       (54,862) (56,554) (54,862) (43,290)
Net income                 0 0 0
Stock issuances under employee 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                 12,944 (1,692) (11,572)
Foreign currency translation adjustment                 0 0 0
Windfall tax benefit - share-based payment awards                   0 0
Other                     0
Cash flow hedge unrealized gain (loss)                 0 0  
Adoption of new accounting standard - share-based payment awards                   0  
Balance (43,610)       (56,554)       (43,610) (56,554) (54,862)
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]                      
Balance       (78,943)       (110,522) (78,943) (110,522) (91,511)
Net income                 0 0 0
Stock issuances under employee 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                 (22,544) 31,579 (19,011)
Windfall tax benefit - share-based payment awards                   0 0
Other                     0
Cash flow hedge unrealized gain (loss)                 0 0  
Adoption of new accounting standard - share-based payment awards                   0  
Balance (101,487)       (78,943)       (101,487) (78,943) (110,522)
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]                      
Balance       $ 904       $ 0 904 0  
Net income                 0 0  
Stock issuances under employee plans                 0 0  
Other issuances of common stock                 0 0  
Unamortized stock compensation expense related to restricted stock awards                 0 0  
Cash dividends paid                 0 0  
Forfeitures and compensation expense related to stock awards                 0 0  
Share Repurchases                 0 0  
Pension liability adjustment                 0 0  
Foreign currency translation adjustment                 0 0  
Windfall tax benefit - share-based payment awards                   0  
Cash flow hedge unrealized gain (loss)                 422 904  
Adoption of new accounting standard - share-based payment awards                   0  
Balance $ 1,326       $ 904       $ 1,326 $ 904 $ 0
[1] Results for the fourth quarter of 2018 include tax benefit of $6.7 million as a result of the finalization of the Company's analysis of the U.S. Tax Cuts and Jobs Act, as well as restructuring and asset impairment charges of $20.5 million. Results for the fourth quarter of 2018 include purchase price accounting amortization of $11.8 million and transaction related expense of $1.2 million.
[2] Results for the third quarter of 2018 include purchase price accounting amortization of $20.3 million and transaction related expenses of $2.4 million.
[3] Results for the second quarter of 2018 include transaction related expenses of $5.8 million.
[4] Results for the fourth quarter of 2017 include tax charges of $15.2 million as a result of the U.S. Tax Cuts and Jobs Act.
[5] Results for the first quarter of 2017 include restructuring and asset impairment charges of $7.3 million.