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Credit Facility (Narrative) (Details) - USD ($) |  | 12 Months Ended
--- | --- | ---
Apr. 03, 2020 | Dec. 31, 2021 | Jan. 01, 2021 | Dec. 27, 2019
Line of Credit Facility [Line Items] |  |  |  |
Incremental debt issuance costs |  | $ 4,000 | $ 21,000 |
Revolving line of credit facility [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Borrowing capacity under credit facility | $ 45,000,000.0 | $ 45,000,000.0 |  |
Maturity date | Nov. 30, 2022 | May 09, 2021 |  |
Increase in interest payable | 0.50% |  |  |
Pledge of capital stock to U.S. subsidiaries |  | 100.00% |  |
Pledge of capital stock to direct foreign subsidiaries |  | 66.00% |  |
Commitment fees percentage |  | 0.125% |  |
Incremental debt issuance costs |  | $ 4,000 | 21,000 | $ 0
Remaining debt issuance cost to be amortized |  | 47,000 |  |
Debt balance |  | $ 0 | $ 0 |
Amount drawn on loan |  |  |  | 1,000,000.0
Outstanding balance |  |  |  | 0
Payment of principal |  |  |  | $ 7,500,000
Revolving line of credit facility [Member] | LIBOR Floor Rate [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Margin percentage base rate | 0.75% |  |  |
Revolving line of credit facility [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Margin percentage base rate |  | 1.50% |  |
Revolving line of credit facility [Member] | Base Rate [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Margin percentage base rate |  | 0.75% |  |

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- Definition Pledge of capital stock to U.S. subsidiaries. + References No definition available. + Details
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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
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- Definition Amount of the total principal payments made during the annual reporting period. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(19)(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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