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v3.21.1

Note 1 - Nature of Business and Summary of Significant Accounting Policies (Details Textual) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Oct. 31, 2020 USD ($) | Aug. 01, 2020 USD ($) | May 01, 2021 USD ($) $ / shares shares | May 02, 2020 USD ($) $ / shares shares | Apr. 27, 2019 USD ($) $ / shares shares | Apr. 28, 2019 USD ($)
Other Commitment, Total |  |  | $ 5,000 |  |  |
Equity Method Investments |  |  | 19,887 | $ 17,257 |  |
Income (Loss) from Equity Method Investments, Total |  |  | (2,370) | (741) | $ (844) |
Capitalized Contract Cost, Net, Total |  |  | 492 | 1,582 |  |
Advertising Expense |  |  | 843 | $ 2,184 | $ 2,969 |
Number of Employees, Voluntary Retirement |  | 60 |  |  |  |
Voluntary Retirement Cost |  | $ 931 |  |  |  |
Number of Employees, Reduction in Force | 150 | 108 |  |  |  |
Severance Costs | $ 2,742 | $ 1,426 |  |  |  |
Government Wage Subsidy |  |  | 1,757 |  |  |
Payroll Tax, Employer, Deferral under the CARES Act |  |  | $ 5,122 |  |  |
Operating Lease, Right-of-Use Asset |  |  |  |  |  | $ 11,101
Share-based Payment Arrangement, Option [Member] |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) | shares |  |  | 2,262 | 2,198 | 2,304 |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Weighted Average Exercise Price (in dollars per share) | $ / shares |  |  | $ 9.11 | $ 9.95 | $ 9.99 |
Minimum [Member] |  |  |  |  |  |
Product Warranty Accrual, Standard Parts Warranty Coverage Term (Year) |  |  | 1 year |  |  |
Product Warranty Accrual, Installation Warranty Coverage Term (Year) |  |  | 1 year |  |  |
Maximum [Member] |  |  |  |  |  |
Product Warranty Accrual, Standard Parts Warranty Coverage Term (Year) |  |  | 5 years |  |  |
Product Warranty Accrual, Installation Warranty Coverage Term (Year) |  |  | 10 years |  |  |
Accounts Payable and Accrued Liabilities [Member] |  |  |  |  |  |
Due to Related Parties, Current, Total |  |  | $ 470 |  |  |
Accrued Expenses [Member] |  |  |  |  |  |
Operating Lease, Liability, Current |  |  | 1,881 | $ 2,416 |  | 2,745
Other Noncurrent Liabilities [Member] |  |  |  |  |  |
Operating Lease, Liability, Noncurrent |  |  |  |  |  | $ 8,356
Research and Development Expense [Member] |  |  |  |  |  |
Related Party Transaction, Amounts of Transaction |  |  | $ 460 | $ 1,113 | $ 0 |
XDC [Member] |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  | 16.40% |  |  |

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