Note 6 - Stock-based Compensation (Details Textual) - USD ($) Pure in Thousands	12 Months Ended
Mar. 25, 2023	Mar. 26, 2022	Mar. 27, 2021
Share-Based Payment Arrangement, Expense, Tax Benefit	$ 400,000	$ 1,400,000	$ 300,000
Share-Based Payment Arrangement, Expense	$ 3,400,000	$ 2,300,000	$ 1,500,000
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)	56,000	131,000	20,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period, Intrinsic Value	$ 300,000	$ 5,300,000	$ 1,600,000
Proceeds from Stock Options Exercised	$ 100,000	$ 1,000,000.0	800,000
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)	46,000
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	20,000
Each Board of Directors Member [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)		10,000
Each of Five Employees [Member] \| Share-Based Payment Arrangement, Employee [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)		2,000
Five Employees [Member] \| Share-Based Payment Arrangement, Employee [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)		10,000
Performance-based Restricted Stock Units [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, Equity Instruments Other than Options, Grants in Period (in shares)	11,000	15,000
Restricted Stock Units (RSUs) [Member]
Share-Based Payment Arrangement, Expense	$ 2,000,000.0	$ 1,600,000	$ 1,400,000
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount	$ 1,900,000
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)	3 years
Restricted Stock Units (RSUs) [Member] \| Non-employee Director [Member]
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures	$ 50,000
Time-vested Restricted Stock Units [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)	19,000	30,000	80,000
Share-Based Payment Arrangement, Option [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)	5 years
Share-Based Payment Arrangement, Expense	$ 1,400,000	$ 700,000	$ 100,000
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount	$ 1,900,000
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)	3 years
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Dividend Rate	0.00%	0.00%	0.00%
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)		5 years
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)		90,000	15,000
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
Share-Based Payment Arrangement, Option [Member] \| Board of Directors Member [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)		5 years
Share-Based Payment Arrangement, Option [Member] \| Five Employees [Member] \| Share-Based Payment Arrangement, Employee [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)		3 years
Share-Based Payment Arrangement, Option [Member] \| Company Employees, Two [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)		3 years	3 years
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)		6,000	5,000
The 2022 Plan [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares)	700,000

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

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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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