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Note 10 - Share-based Compensation (Details Textual) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended		6 Months Ended		12 Months Ended
	Jan. 01, 2001	Jun. 28, 2025	Jun. 29, 2024	Jun. 28, 2025	Jun. 29, 2024	Dec. 31, 2022	Jan. 01, 2022	Jan. 02, 2021	Dec. 29, 2018	Dec. 31, 2016	Dec. 27, 2015	Dec. 28, 2024	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)				10 years
Share-Based Payment Arrangement, Expense		$ 1,133	$ 752	$ 1,906	$ 1,387
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount		$ 8,100		$ 8,100
Common Stock, Capital Shares Reserved for Future Issuance (in shares)		1,002,627		1,002,627								1,137,220
Dividends Payable		$ 0		$ 0
Employee Stock Purchase Plan [Member]
Share-Based Payment Arrangement, Expense				$ 148	164
Share-based Compensation Arrangement by Share-based Payment Award, Discount from Market Price, Offering Date	85.00%
Share-based Compensation Arrangement by Share-based Payment Award, Maximum Employee Subscription Rate	10.00%
Share-based Compensation Arrangement by Share-based Payment Award, Maximum Number of Shares Per Employee (in shares)	3,000
Additional Shares of Common Stock Reserved for Future Issuance (in shares)							400,000		300,000		300,000
Common Stock, Capital Shares Reserved for Future Issuance (in shares)							1,800,000		1,400,000		1,100,000
Stock Issued During Period, Shares, Employee Stock Purchase Plans (in shares)				18,192
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares)		233,927		233,927
The 2014 Plan [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares)		247,417		247,417
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares)						2,975,000							625,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized (in shares)						1,000,000		850,000		500,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Outstanding		$ 12,000	13,700	$ 12,000	13,700
Performance Shares [Member]
Share-Based Payment Arrangement, Expense				1,257	$ 665
Time-based Restricted Stock Units [Member]
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount		2,300		$ 2,300
Time-based Restricted Stock Units [Member] | Immediately Vested [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)				0	0
Time-based Restricted Stock Units [Member] | The 2014 Plan [Member]
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount		$ 2,300		$ 2,300
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number (in shares)		234,020		234,020								289,421
Share Price (in dollars per share)		$ 23.11		$ 23.11
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Nonvested		$ 5,400		$ 5,400
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)				18,500
Performance-based Restricted Stock Units [Member]
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount		5,800		$ 5,800
Performance-based Restricted Stock Units [Member] | The 2014 Plan [Member]
Share-Based Payment Arrangement, Expense		$ 805	$ 406	$ 1,257	$ 665
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number (in shares)		287,263		287,263								300,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)				99,763
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)				1 year
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)				5 years

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

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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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