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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.

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