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Note 5 - Long-term Debt (Details Textual) - USD ($) $ in Thousands |  | 9 Months Ended
--- | --- | ---
May 17, 2019 | Sep. 26, 2020 | Sep. 28, 2019
Debt Instrument, Face Amount |  | $ 171,875 |
Repayments of Long-term Debt, Total |  | 26,250 | $ 311,408
Credit Agreement, May 17, 2019 [Member] | Revolving Credit Facility [Member] |  |  |
Debt Instrument, Term (Year) | 5 years |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 75,000 |  |
Proceeds from Lines of Credit, Total |  | $ 50,000 |
Debt Instrument, Interest Rate, Effective Percentage |  | 1.42% |
Line of Credit Facility, Commitment Fee Percentage |  | 0.20% |
Credit Agreement, May 17, 2019 [Member] | Secured Term Loan [Member] |  |  |
Debt Instrument, Term (Year) | 5 years |  |
Debt Instrument, Face Amount | $ 175,000 |  |
Repayments of Long-term Debt, Total |  | $ 26,300 |
Repayments of Long Term Debt, Accelerated Principal Payments |  | $ 13,100 |
Debt Instrument, Interest Rate, Effective Percentage |  | 1.62% |

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- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120520924&loc=SL6036836-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28551-108399 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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