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Note 4 - Revenue Recognition - Contract Assets and Liabilities (Details) - USD ($)
 6 Months Ended
Oct. 30, 2021
May 01, 2021
Contract assets $ 40,231,000 $ 32,799,000
Contract assets $ 7,432,000  
Contract assets 22.70%  
Contract liabilities - current $ 70,158,000 64,495,000
Contract liabilities - current $ 5,663,000  
Contract liabilities - current 8.80%  
Contract liabilities - noncurrent $ 10,707,000 $ 10,720,000
Contract liabilities - noncurrent $ (13,000)  
Contract liabilities - noncurrent (0.10%)  
Less: reductions for revenue recognized $ (42,300)  
Service-type Warranty Contracts [Member]    
Balance at beginning of period 24,590,000  
New contracts sold 22,764,000  
Less: reductions for revenue recognized (19,955,000)  
Foreign currency translation and other 260,000  
Balance at end of period $ 27,659,000