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Note 10 - Fair Value Measurement - Fair Value Hierarchy (Details) - Fair Value, Recurring [Member] - USD ($) $ in Thousands | Jan. 29, 2022 | May 01, 2021
--- | --- | ---
Cash and cash equivalents | $ 30,883 | $ 77,590
Restricted cash | 836 | 2,812
Derivatives - asset position | 227 | 4
Derivatives - liability position | (41) | (261)
Fair Value, Net Asset (Liability), Total | 35,941 | 79,782
Acquisition-related contingent consideration |  | (363)
US Government Agencies Debt Securities [Member] |  |
US Government Securities | 3,489 |
US Government-sponsored Enterprises Debt Securities [Member] |  |
US Government Securities | 547 |
Fair Value, Inputs, Level 1 [Member] |  |
Cash and cash equivalents | 30,883 | 77,590
Restricted cash | 836 | 2,812
Derivatives - asset position | 0 | 0
Derivatives - liability position | 0 | 0
Fair Value, Net Asset (Liability), Total | 35,208 | 80,402
Acquisition-related contingent consideration |  | 0
Fair Value, Inputs, Level 1 [Member] | US Government Agencies Debt Securities [Member] |  |
US Government Securities | 3,489 |
Fair Value, Inputs, Level 1 [Member] | US Government-sponsored Enterprises Debt Securities [Member] |  |
US Government Securities | 0 |
Fair Value, Inputs, Level 2 [Member] |  |
Cash and cash equivalents | 0 | 0
Restricted cash | 0 | 0
Derivatives - asset position | 227 | 4
Derivatives - liability position | (41) | (261)
Fair Value, Net Asset (Liability), Total | 733 | (257)
Acquisition-related contingent consideration |  | 0
Fair Value, Inputs, Level 2 [Member] | US Government Agencies Debt Securities [Member] |  |
US Government Securities |  |
Fair Value, Inputs, Level 2 [Member] | US Government-sponsored Enterprises Debt Securities [Member] |  |
US Government Securities | 547 |
Fair Value, Inputs, Level 3 [Member] |  |
Cash and cash equivalents | 0 | 0
Restricted cash | 0 | 0
Derivatives - asset position | 0 | 0
Derivatives - liability position | 0 | 0
Fair Value, Net Asset (Liability), Total | 0 | (363)
Acquisition-related contingent consideration |  | $ (363)
Fair Value, Inputs, Level 3 [Member] | US Government Agencies Debt Securities [Member] |  |
US Government Securities |  |
Fair Value, Inputs, Level 3 [Member] | US Government-sponsored Enterprises Debt Securities [Member] |  |
US Government Securities | $ 0 |

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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(6)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=124258926&loc=SL82898722-210454 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=124260329&loc=d3e26610-111562 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27161-111563 + Details
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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References No definition available. + Details
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