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Note 3 - Stock-based Compensation (Details Textual) - USD ($) Pure in Thousands, $ in Millions	3 Months Ended			6 Months Ended
	Sep. 23, 2023	Jun. 24, 2023	Sep. 24, 2022	Sep. 23, 2023	Sep. 24, 2022
Share-Based Payment Arrangement, Expense, Tax Benefit				$ 0.6	$ 0.5
Share-Based Payment Arrangement, Expense				$ 2.2	1.9
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Dividend Rate				0.00%
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)		27,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period, Intrinsic Value				$ 0.3	0.2
Proceeds from Stock Options Exercised				$ 0.1	$ 0.1
Board of Directors Member [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)				5 years
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)				10,000
Director [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)				5 years	5 years
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)				10,000	10,000
Performance-based Restricted Stock Units [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)		3 years
Restricted Stock Units (RSUs) [Member]
Share-Based Payment Arrangement, Expense				$ 1.5	$ 1.2
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount	$ 5.2			$ 5.2
Share-Based Payment Arrangement, Option [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)				5 years	3 years
Share-Based Payment Arrangement, Expense				$ 0.6	$ 0.7
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount	$ 2.3			$ 2.3
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Dividend Rate	0.00%		0.00%	0.00%	0.00%
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)					46,000
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)				3 years
Share-Based Payment Arrangement, Option [Member] \| Share-Based Payment Arrangement, Employee [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)				3 years
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)				7,000
Share-Based Payment Arrangement, Option [Member] \| Minimum [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period (Year)				5 years
Share-Based Payment Arrangement, Option [Member] \| Maximum [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period (Year)				10 years
The 2021 Plan [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares)	600,000			600,000