Note 8 - Stock-based Compensation (Details Textual) - USD ($) shares in Thousands	3 Months Ended
Apr. 04, 2021	Mar. 29, 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
Share-based Payment Arrangement, Expense	$ 368,000	$ (398,000)
Share-based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount	0
Employee Stock Purchase Plan [Member]
Share-based Payment Arrangement, Expense	30,000	0
Share-based Payment Arrangement, Option [Member]
Share-based Payment Arrangement, Expense	0	14,000
RSUs and PRSUs [Member]
Share-based Payment Arrangement, Expense	338,000	(418,000)
Restricted Stock Units (RSUs) [Member]
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total	$ 373,000	$ 2,400,000
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)	1 year 7 months 24 days	1 year 7 months 24 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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