Note 8 - Stock-based Compensation (Details Textual) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended	9 Months Ended
Oct. 02, 2022	Oct. 03, 2021	Oct. 02, 2022	Oct. 03, 2021
Share-Based Payment Arrangement, Amount Capitalized	$ 0	$ 0	$ 0	$ 0
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)	0	0	0	0
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Forfeitures and Expirations in Period, Total (in shares)			0	0
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period (in shares)			0	0
Share-Based Payment Arrangement, Expense	$ 487	$ 885	$ 1,347	$ 1,455
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Nonvested, Net of Forfeitures, Fair Value	0		0
Employee Stock Purchase Plan [Member]
Share-Based Payment Arrangement, Expense	20	31	54	97
Share-Based Payment Arrangement, Option [Member]
Share-Based Payment Arrangement, Expense			0	0
RSUs and PRSUs [Member]
Share-Based Payment Arrangement, Expense	500	900	1,300	1,400
Restricted Stock Units (RSUs) [Member]
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total	$ 1,100	$ 2,100	$ 1,100	$ 2,100
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)			1 year 6 months 3 days

Fair value of nonvested options, net of forfeitures under share based payment arrangement.

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Amount of cost capitalized for award under share-based payment arrangement.

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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iv)
-URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901

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Gross number of share options (or share units) granted during the period.

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Number of share options (or share units) exercised during the current period.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Topic 718
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