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Note 5 - Debt - Carrying Amounts of Long-term Debt (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 30, 2017
--- | --- | ---
Unamortized debt issuance costs | $ (5,184) | $ (4,881)
Total debt | 697,598 | 495,611
Less: Current maturities | 10,060 | 6,250
Total long-term debt | 687,538 | 489,361
Line of Credit [Member] |  |
Debt, carrying amount |  |
Unsecured Debt [Member] |  |
Debt, carrying amount | 157,500 | 122,500
Euro Senior Notes, Series A [Member] |  |
Debt, carrying amount | 135,335 | 139,623
Euro Senior Notes, Series B [Member] |  |
Debt, carrying amount | 109,887 | 113,369
US Senior Notes, Series A Due 2022 [Member] |  |
Debt, carrying amount | 25,000 | 25,000
US Senior Notes, Series B Due 2027 [Member] |  |
Debt, carrying amount | 100,000 | 100,000
US Senior Notes, Series A Due 2025 [Member] |  |
Debt, carrying amount | 50,000 |
US Senior Notes, Series B Due 2030 [Member] |  |
Debt, carrying amount | 125,000 |
Notes Payable, Other Payables [Member] |  |
Debt, carrying amount | $ 60 |

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