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Note 7 - Shareholders' Equity - Activity in Shareholders' Equity (Details) - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Mar. 31, 2019 | Jul. 01, 2018 | Apr. 01, 2018 | Jun. 30, 2019 | Jul. 01, 2018
Balance |  | $ 354,663 |  |  | $ 354,663 |
Net income | $ 29,499 |  | $ 20,602 |  | 36,558 | $ 35,686
Share repurchases | (25,200) |  |  |  |  |
Pension liability adjustment | 829 |  | 3,459 |  | 738 | 1,243
Foreign currency translation adjustment | 4,249 |  | (20,773) |  | (954) | (11,943)
Cash flow hedge unrealized gain (loss) | (4,667) |  | $ 647 |  | (7,973) | $ 2,279
Balance | $ 352,113 |  |  |  | $ 352,113 |
Common Stock [Member] |  |  |  |  |  |
Balance (in shares) | 60,016 | 59,508 | 59,498 | 59,806 | 59,508 | 59,806
Balance | $ 6,002 | $ 5,951 | $ 5,950 | $ 5,981 | $ 5,951 | $ 5,981
Net income | $ 0 | $ 0 | $ 0 | $ 0 |  |
Stock issuances under employee plans (in shares) | 2 | 509 | 4 | 175 |  |
Stock issuances under employee plans | $ 0 | $ 51 | $ 0 | $ 17 |  |
Other issuances of common stock (in shares) | (1) | 224 | 0 | 187 |  |
Other issuances of common stock | $ 0 | $ 22 | $ 0 | $ 19 |  |
Unamortized stock compensation expense related to restricted stock awards | 0 | 0 | 0 | 0 |  |
Cash dividends paid | $ 0 | $ 0 | $ 0 | $ 0 |  |
Forfeitures and compensation expense related to stock awards (in shares) | (28) | (225) | (9) | (55) |  |
Forfeitures and compensation expense related to stock awards | $ (3) | $ (22) | $ (1) | $ (6) |  |
Share repurchases (in shares) | (1,556) | 0 | 0 | (615) |  |
Share repurchases | $ (156) | $ 0 | $ 0 | $ (61) |  |
Pension liability adjustment | 0 | 0 | 0 | 0 |  |
Foreign currency translation adjustment | 0 | 0 | 0 | 0 |  |
Cash flow hedge unrealized gain (loss) | $ 0 | $ 0 | $ 0 | $ 0 |  |
Balance (in shares) | 58,433 | 60,016 | 59,493 | 59,498 | 58,433 | 59,493
Balance | $ 5,843 | $ 6,002 | $ 5,949 | $ 5,950 | $ 5,843 | $ 5,949
Additional Paid-in Capital [Member] |  |  |  |  |  |
Balance | 270,655 | 270,269 | 260,115 | 271,271 | 270,269 | 271,271
Net income | 0 | 0 | 0 | 0 |  |
Stock issuances under employee plans | 6 | 379 | 35 | 102 |  |
Other issuances of common stock | 0 | 3,900 | 0 | 4,769 |  |
Unamortized stock compensation expense related to restricted stock awards | 52 | (3,922) | 0 | (4,788) |  |
Cash dividends paid | 0 | 0 | 0 | 0 |  |
Forfeitures and compensation expense related to stock awards | 1,506 | 29 | 2,135 | 3,185 |  |
Share repurchases | (24,998) | 0 | 0 | (14,424) |  |
Pension liability adjustment | 0 | 0 | 0 | 0 |  |
Foreign currency translation adjustment | 0 | 0 | 0 | 0 |  |
Cash flow hedge unrealized gain (loss) | 0 | 0 | 0 | 0 |  |
Balance | 247,221 | 270,655 | 262,285 | 260,115 | 247,221 | 262,285
Retained Earnings [Member] |  |  |  |  |  |
Balance | 225,373 | 222,214 | 198,649 | 187,433 | 222,214 | 187,433
Net income | 29,499 | 7,059 | 20,602 | 15,084 |  |
Stock issuances under employee plans | 0 | 0 | 0 | 0 |  |
Other issuances of common stock | 0 | 0 | 0 | 0 |  |
Unamortized stock compensation expense related to restricted stock awards | 0 | 0 | 0 | 0 |  |
Cash dividends paid | (3,863) | (3,900) | (3,868) | (3,868) |  |
Forfeitures and compensation expense related to stock awards | 0 | 0 | 0 | 0 |  |
Share repurchases | 0 | 0 | 0 | 0 |  |
Pension liability adjustment | 0 | 0 | 0 | 0 |  |
Foreign currency translation adjustment | 0 | 0 | 0 | 0 |  |
Cash flow hedge unrealized gain (loss) | 0 | 0 | 0 | 0 |  |
Balance | 251,009 | 225,373 | 215,383 | 198,649 | 251,009 | 215,383
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] |  |  |  |  |  |
Balance | (43,701) | (43,610) | (58,770) | (56,554) | (43,610) | (56,554)
Net income | 0 | 0 | 0 | 0 |  |
Stock issuances under employee plans | 0 | 0 | 0 | 0 |  |
Other issuances of common stock | 0 | 0 | 0 | 0 |  |
Unamortized stock compensation expense related to restricted stock awards | 0 | 0 | 0 | 0 |  |
Cash dividends paid | 0 | 0 | 0 | 0 |  |
Forfeitures and compensation expense related to stock awards | 0 | 0 | 0 | 0 |  |
Share repurchases | 0 | 0 | 0 | 0 |  |
Pension liability adjustment | 829 | (91) | 3,459 | (2,216) |  |
Foreign currency translation adjustment | 0 | 0 | 0 | 0 |  |
Cash flow hedge unrealized gain (loss) | 0 | 0 | 0 | 0 |  |
Balance | (42,872) | (43,701) | (55,311) | (58,770) | (42,872) | (55,311)
Accumulated Foreign Currency Adjustment Attributable to Parent [Member] |  |  |  |  |  |
Balance | (106,690) | (101,487) | (70,113) | (78,943) | (101,487) | (78,943)
Net income | 0 | 0 | 0 | 0 |  |
Stock issuances under employee plans | 0 | 0 | 0 | 0 |  |
Other issuances of common stock | 0 | 0 | 0 | 0 |  |
Unamortized stock compensation expense related to restricted stock awards | 0 | 0 | 0 | 0 |  |
Cash dividends paid | 0 | 0 | 0 | 0 |  |
Forfeitures and compensation expense related to stock awards | 0 | 0 | 0 | 0 |  |
Share repurchases | 0 | 0 | 0 | 0 |  |
Pension liability adjustment | 0 | 0 | 0 | 0 |  |
Foreign currency translation adjustment | 4,249 | (5,203) | (20,773) | 8,830 |  |
Cash flow hedge unrealized gain (loss) | 0 | 0 | 0 | 0 |  |
Balance | (102,441) | (106,690) | (90,886) | (70,113) | (102,441) | (90,886)
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member] |  |  |  |  |  |
Balance | (1,980) | 1,326 | 2,536 | 904 | 1,326 | 904
Net income | 0 | 0 | 0 | 0 |  |
Stock issuances under employee plans | 0 | 0 | 0 | 0 |  |
Other issuances of common stock | 0 | 0 | 0 | 0 |  |
Unamortized stock compensation expense related to restricted stock awards | 0 | 0 | 0 | 0 |  |
Cash dividends paid | 0 | 0 | 0 | 0 |  |
Forfeitures and compensation expense related to stock awards | 0 | 0 | 0 | 0 |  |
Share repurchases | 0 | 0 | 0 | 0 |  |
Pension liability adjustment | 0 | 0 | 0 | 0 |  |
Foreign currency translation adjustment | 0 | 0 | 0 | 0 |  |
Cash flow hedge unrealized gain (loss) | (4,667) | (3,306) | 647 | 1,632 |  |
Balance | $ (6,647) | $ (1,980) | $ 3,183 | $ 2,536 | $ (6,647) | $ 3,183

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