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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%