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Note 9 - Stock-based Compensation (Details Textual) - USD ($) $ / shares in Units, $ in Thousands, shares in Millions		12 Months Ended
	Jan. 01, 2025	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Jun. 30, 2020
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share)		$ 1.13
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Intrinsic Value		$ 579	$ 11	$ 6,316
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount		18,100
Share-Based Payment Arrangement, Option [Member]
Share-Based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount		$ 11,100
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition		1 year 6 months
Restricted Stock Units (RSUs) [Member]
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition		1 year 6 months
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount		$ 7,000
The 2020 Stock Option and Incentive Plan [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized					2.9
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant		1.4
The 2020 Stock Option and Incentive Plan [Member] | Share-Based Payment Arrangement, Option [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period		4 years
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period		10 years
The 2020 Stock Option and Incentive Plan [Member] | Subsequent Event [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant	6.9
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Additional Shares Authorized	5.5

X

- Definition

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

+ References

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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