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Note 18 - Acquisition of Nora (Details Textual) $ in Thousands, € in Millions |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Aug. 07, 2018 USD ($) | Aug. 07, 2018 EUR (€) | Dec. 30, 2018 USD ($) | Sep. 30, 2018 USD ($) | Jul. 01, 2018 USD ($) | Dec. 30, 2018 USD ($) | Dec. 31, 2017 USD ($) | Jan. 01, 2017 USD ($) | Jul. 01, 2018 EUR (€)
Payments to Acquire Businesses, Net of Cash Acquired, Total |  |  |  |  |  | $ 400,697 | $ 0 | $ 0 |
Goodwill, Ending Balance |  |  | $ 245,815 |  |  | $ 245,815 | 68,754 |  |
Number of Operating Segments |  |  |  |  |  | 3 |  |  |
Goodwill, Purchase Accounting Adjustments |  |  |  |  |  | $ 1,377 |  |  |
Business Combination, Acquisition Related Costs |  |  | 1,200 | $ 2,400 | $ 5,800 |  |  |  |
Payments of Debt Issuance Costs |  |  |  |  |  | 8,806 | $ 1,427 | $ 0 |
Syndicated Facility Agreement [Member] | Term Loan [Member] |  |  |  |  |  |  |  |  |
Payments of Debt Issuance Costs |  |  |  |  |  | 8,800 |  |  |
Nora [Member] |  |  |  |  |  |  |  |  |
Business Combination, Consideration Transferred, Total | $ 447,200 | € 385.1 |  |  |  |  |  |  |
Cash Acquired from Acquisition | 46,500 | 40.0 |  |  |  |  |  |  |
Payments to Acquire Businesses, Net of Cash Acquired, Total | 400,700 | € 345.1 |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill, Total | 103,300 |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Step-up of Inventory | 26,600 |  |  |  |  |  |  |  |
Goodwill, Ending Balance | 184,725 |  | 184,700 |  |  | 184,700 |  |  |
Finite-Lived Intangible Assets, Net, Ending Balance | 103,300 |  | 97,700 |  |  | 97,700 |  |  |
Goodwill, Purchase Accounting Adjustments | 1,400 |  |  |  |  | 1,400 |  |  |
Business Acquisition, Goodwill, Expected Tax Deductible Amount | 0 |  | $ 0 |  |  | 0 |  |  |
Business Combination, Acquired Receivable, Fair Value | 31,000 |  |  |  |  |  |  |  |
Business Combination, Acquired Receivables, Gross Contractual Amount | 32,800 |  |  |  |  |  |  |  |
Business Combination, Acquired Receivables, Estimated Uncollectible | 1,800 |  |  |  |  |  |  |  |
Business Combination, Acquisition Related Costs |  |  |  |  |  | 9,500 |  |  |
Nora [Member] | Developed Technology Rights [Member] |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill, Total | $ 39,100 |  |  |  |  |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 7 years | 7 years |  |  |  |  |  |  |
Nora [Member] | Order or Production Backlog [Member] |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill, Total | $ 3,400 |  |  |  |  |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 180 days | 180 days |  |  |  |  |  |  |
Nora [Member] | Trademarks and Trade Names [Member] |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill, Total | $ 60,800 |  |  |  |  |  |  |  |
Nora [Member] | Other Expense [Member] |  |  |  |  |  |  |  |  |
Loss Recognized Upon Termination of Option Instrument |  |  |  | $ 1,400 |  |  |  |  |
Business Combination, Acquisition Related Costs |  |  |  |  |  | 4,200 |  |  |
Nora [Member] | Selling, General and Administrative Expenses [Member] |  |  |  |  |  |  |  |  |
Business Combination, Acquisition Related Costs |  |  |  |  |  | $ 5,300 |  |  |
Nora [Member] | Foreign Exchange Option [Member] |  |  |  |  |  |  |  |  |
Derivative, Notional Amount |  |  |  |  | $ 364,000 |  |  |  | € 315.0
Derivative, Term of Contract |  |  |  |  | 120 days |  |  |  |
Nora [Member] | Foreign Exchange Option [Member] | Other Expense [Member] |  |  |  |  |  |  |  |  |
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net, Total |  |  |  |  | $ 2,800 |  |  |  |

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