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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

X

- Definition

The fair value portion of restricted cash and cash equivalents.

+ References

No definition available.

+ Details

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X

- 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

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X

- Definition

Amount of liability recognized arising from contingent consideration in a business combination.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=120321790&loc=d3e6927-128479

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-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 35
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=116859824&loc=d3e6819-128478

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-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 25
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6408-128476

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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

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X

- Definition

Fair value of asset after deduction of liability.

+ References

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- Definition

Fair value portion of asset contracts related to the exchange of different currencies, including, but not limited to, foreign currency options, forward contracts, and swaps.

+ References

No definition available.

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- Definition

Fair value portion of liability contracts related to the exchange of different currencies, including, but not limited to, foreign currency options, forward (delivery or nondelivery) contracts, and swaps entered into.

+ References

No definition available.

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