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Nature of Business and Summary of Significant Accounting Policies (Details Textual) - USD ($)
 12 Months Ended
May 02, 2025
Apr. 27, 2024
Apr. 29, 2023
Apr. 30, 2022
Oct. 29, 2023
Segment Reporting Information [Line Items]          
Contract with customer assets   $ 55,800,000 $ 46,789,000    
Gross profit   222,443,000 151,355,000 $ 116,697,000  
Equity method investments   1,813,000 11,934,000    
Income (loss) from equity method investments   (3,764,000) (3,332,000) (2,970,000)  
Impairment   4,576,000     $ 4,576,000
Equity investees impairment   6,359,000 4,473,000 0  
Accounts payable   146,000 52,000    
Amount invested   5,050,000 4,315,000 7,848,000  
Purchase of convertible notes   14,241,000 8,789,000    
Convertible note and investment in affiliates, amount   16,054,000 20,723,000    
Cash and cash equivalents   81,299,000 23,982,000 17,143,000  
Capitalized contract cost, net   384,000 860,000    
Self insured, individual retention   250,000      
Forecast          
Segment Reporting Information [Line Items]          
Convertible note and investment in affiliates, amount $ 500,000        
Geographic Distribution, Foreign          
Segment Reporting Information [Line Items]          
Cash and cash equivalents   13,469,000      
Subsidiaries | Geographic Distribution, Foreign          
Segment Reporting Information [Line Items]          
Cash and cash equivalents   8,029,000      
Variable Interest Entity, Primary Beneficiary          
Segment Reporting Information [Line Items]          
Contract with customer assets   1,955,000 5,223,000    
Contract with customer, liability   38,000      
Gross profit   2,761,000 2,748,000    
United States of America, Dollars          
Segment Reporting Information [Line Items]          
Cash and cash equivalents   67,830,000      
United States of America, Dollars | Subsidiaries          
Segment Reporting Information [Line Items]          
Cash and cash equivalents   275,000      
Product Design And Development          
Segment Reporting Information [Line Items]          
Related party transaction, amounts of transaction   $ 577,000 672,000 $ 1,520,000  
Miortech          
Segment Reporting Information [Line Items]          
Equity method investment, ownership percentage   55.90%      
Impairment   $ 1,392,000 4,473,000    
XDC          
Segment Reporting Information [Line Items]          
Equity investees impairment   $ 4,967,000      
XdisplayTM          
Segment Reporting Information [Line Items]          
Equity method investment, ownership percentage   16.40%      
Convertible note          
Segment Reporting Information [Line Items]          
Amount invested   $ 5,050,000 $ 4,315,000    
Antidilutive securities excluded from computation of earnings per share, amount (in shares)   3,915,000      
Debt instrument, face amount   $ 25,000,000      
Stock options          
Segment Reporting Information [Line Items]          
Antidilutive securities excluded from computation of earnings per share, amount (in shares)   675,000 2,084,000 1,846,000  
Antidilutive securities excluded from computation of earnings per share, weighted average exercise price (in dollars per share)   $ 10.29 $ 7.47 $ 9.15  
Minimum          
Segment Reporting Information [Line Items]          
Product warranty accrual, standard parts warranty coverage term (year)   1 year      
Product warranty accrual, installation warranty coverage term (year)   1 year      
Maximum          
Segment Reporting Information [Line Items]          
Product warranty accrual, standard parts warranty coverage term (year)   5 years      
Product warranty accrual, installation warranty coverage term (year)   10 years