Note 8 - Stock-based Compensation (Details Textual) - USD ($) shares in Thousands	3 Months Ended	9 Months Ended
Oct. 03, 2021	Sep. 27, 2020	Oct. 03, 2021	Sep. 27, 2020
Share-based Payment Arrangement, Amount Capitalized			$ 0	$ 0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)	0	0	0	0
Share-based Payment Arrangement, Expense	$ 885,000	$ 258,000	$ 1,455,000	$ 601,000
Share-based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount	0		0
Employee Stock Purchase Plan [Member]
Share-based Payment Arrangement, Expense	31,000	16,000	97,000	24,000
Share-based Payment Arrangement, Option [Member]
Share-based Payment Arrangement, Expense	0	11,000	0	39,000
RSUs and PRSUs [Member]
Share-based Payment Arrangement, Expense	854,000	231,000	1,400,000	538,000
Restricted Stock Units (RSUs) [Member]
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total	$ 2,100,000	$ 1,200,000	$ 2,100,000	$ 1,200,000
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)	1 year 4 months 20 days		1 year 4 months 20 days

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

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Amount of cost to be recognized for option under share-based payment arrangement.

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