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Note 10 - Shareholders' Equity and Share-Based Compensation (Details Textual) $ / shares in Units, $ in Thousands | 12 Months Ended
--- | ---
May 01, 2021 USD ($) $ / shares shares | May 02, 2020 USD ($) shares | Apr. 27, 2019 USD ($) shares
Common Stock, Shares Authorized and Undesignated (in shares) | 120,000,000 |  |
Common Stock, Shares Authorized (in shares) | 115,000,000 | 115,000,000 |
Common Stock, Shares Undesignated (in shares) | 5,000,000 |  |
Common Share Purchase Right Per Common Share, Ratio | 1 |  |
Common Share Rights Exercise, Period, Option One (Day) | 10 days |  |
Sale of Stock, Percentage of Ownership after Transaction | 20.00% |  |
Common Share Rights Exercise, Period, Option Two (Year) | 10 years |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) | 3 years 1 month 6 days |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number (in shares) | 1,478,000 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value | $ | $ 0 | $ 0 | $ 98
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value | $ | $ 451 | $ 566 | $ 667
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares) | 2,868,000 |  |
Stock Issued During Period, Shares, Employee Stock Purchase Plans (in shares) | 170,000 | 453,000 | 241,000
Share-based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount | $ | $ 2,832 |  |
Proceeds from Stock Options Exercised | $ | 0 | $ 0 | $ 1,318
Share-based Payment Arrangement, Expense, Tax Benefit | $ | $ 70 | 92 | 52
Employee Stock Purchase Plan [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) | 1 year |  |
Share-based Compensation Arrangement by Share-based Payment Award, Maximum Employee Subscription Rate | 15.00% |  |
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, Number of Shares Available for Grant (in shares) | 4,000,000 |  |
Common Stock, Capital Shares Reserved for Future Issuance (in shares) | 809,000 |  |
Share-based Payment Arrangement, Option [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year) | 10 years |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) | 5 years |  |
Share-based Payment Arrangement, Option [Member] | Independent Directors [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year) | 7 years |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) | 1 year |  |
Restricted Stock [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value | $ | $ 1,293 | $ 1,415 | $ 1,530
Restricted Stock [Member] | Independent Directors [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) | 1 year |  |
Restricted Stock [Member] | Employees [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) | 5 years |  |
Restricted Stock and Restricted Stock Units [Member] |  |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total | $ | $ 1,787 |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) | 2 years 7 months 6 days |  |
In Money Options [Member] |  |  |
Share-based Payment Arrangement, Option, Exercise Price Range, Upper Range Limit (in dollars per share) | $ / shares | $ 6.17 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number (in shares) | 0 |  |
Preferred Share Purchase Right [Member] |  |  |
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares) | 0.001 |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares | $ 25 |  |

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