XML 47 R33.htm IDEA: XBRL DOCUMENT
v3.22.4

Note 5 - Financial Instruments Measured at Fair Value (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2022
Notes Tables |
Unrealized Gain (Loss) on Investments [Table Text Block] |
|  | At December 31, 2022 |
|  |  |  |  |  | Gross |  |  | Gross |  |  | Estimated |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Fair |
|  | Cost |  |  | Gains |  |  | Losses (1) |  |  | Value |
Corporate debt securities (2) |  | $ | 59,283 |  |  | $ | 30 |  |  | $ | 240 |  |  | $ | 59,073 |
U.S. treasury securities |  |  | 34,614 |  |  |  | 1 |  |  |  | 418 |  |  |  | 34,197 |
Bank certificates of deposit |  |  | 36,500 |  |  |  | 20 |  |  |  | 41 |  |  |  | 36,479 |
Asset-backed securities |  |  | 12,727 |  |  |  | 10 |  |  |  | 79 |  |  |  | 12,658 |
Foreign government security |  |  | 828 |  |  |  | - |  |  |  | - |  |  |  | 828 |
|  | $ | 143,952 |  |  | $ | 61 |  |  | $ | 778 |  |  | $ | 143,235 |
|  | At December 25, 2021 |
|  |  |  |  |  | Gross |  |  | Gross |  |  | Estimated |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Fair |
|  | Cost |  |  | Gains |  |  | Losses (1) |  |  | Value |
Corporate debt securities (2) |  | $ | 84,060 |  |  | $ | 2 |  |  | $ | 31 |  |  | $ | 84,031 |
U.S. treasury securities |  |  | 3,953 |  |  |  | - |  |  |  | 5 |  |  |  | 3,948 |
Bank certificates of deposit |  |  | 800 |  |  |  | - |  |  |  | - |  |  |  | 800 |
Foreign government security |  |  | 925 |  |  |  | - |  |  |  | - |  |  |  | 925 |
|  | $ | 89,738 |  |  | $ | 2 |  |  | $ | 36 |  |  | $ | 89,704 |
Investments Classified by Contractual Maturity Date [Table Text Block] |
|  | Amortized |  |  | Estimated |
(in thousands) |  | Cost |  |  | Fair Value |
Due in one year or less |  | $ | 112,956 |  |  | $ | 112,683 |
Due after one year through three years |  |  | 30,996 |  |  |  | 30,552 |
|  | $ | 143,952 |  |  | $ | 143,235 |
Fair Value, Assets Measured on Recurring Basis [Table Text Block] |
|  | Fair value measurements at December 31, 2022 using: |
|  |  |  |  |  |  |  |  |  |  |  |  |  | Total estimated |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | fair value |
Cash |  | $ | 190,371 |  |  | $ | - |  |  | $ | - |  |  | $ | 190,371 |
Corporate debt securities |  |  | - |  |  |  | 69,753 |  |  |  | - |  |  |  | 69,753 |
Money market funds |  |  | - |  |  |  | 40,290 |  |  |  | - |  |  |  | 40,290 |
Bank certificates of deposit |  |  | - |  |  |  | 37,480 |  |  |  | - |  |  |  | 37,480 |
U.S. treasury securities |  |  | - |  |  |  | 34,196 |  |  |  | - |  |  |  | 34,196 |
Asset-backed securities |  |  | - |  |  |  | 12,658 |  |  |  | - |  |  |  | 12,658 |
Foreign government security |  |  | - |  |  |  | 828 |  |  |  | - |  |  |  | 828 |
|  | $ | 190,371 |  |  | $ | 195,205 |  |  | $ | - |  |  | $ | 385,576 |
|  | Fair value measurements at December 25, 2021 using: |
|  |  |  |  |  |  |  |  |  |  |  |  |  | Total estimated |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | fair value |
Cash |  | $ | 195,297 |  |  | $ | - |  |  | $ | - |  |  | $ | 195,297 |
Money market funds |  |  | - |  |  |  | 92,400 |  |  |  | - |  |  |  | 92,400 |
Corporate debt securities |  |  | - |  |  |  | 86,535 |  |  |  | - |  |  |  | 86,535 |
U.S. treasury securities |  |  | - |  |  |  | 3,948 |  |  |  | - |  |  |  | 3,948 |
Foreign government security |  |  | - |  |  |  | 925 |  |  |  | - |  |  |  | 925 |
Bank certificates of deposit |  |  | - |  |  |  | 800 |  |  |  | - |  |  |  | 800 |
|  | $ | 195,297 |  |  | $ | 184,608 |  |  | $ | - |  |  | $ | 379,905 |

X
- Definition Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + Details
Name: | us-gaap_FairValueAssetsMeasuredOnRecurringBasisTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of maturities of an entity's investments as well as any other information pertinent to the investments. + References No definition available. + Details
Name: | us-gaap_InvestmentsClassifiedByContractualMaturityDateTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_TableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of unrealized gains and losses on investments. + References No definition available. + Details
Name: | us-gaap_UnrealizedGainLossOnInvestmentsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration