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Note 6 - Receivables (Details Textual) - USD ($)
$ in Thousands
12 Months Ended
May 01, 2021
May 02, 2020
Accounts Receivable, Allowance for Credit Loss, Current $ 3,942 $ 2,828
Accounts Receivable, after Allowance for Credit Loss, Current, Total 67,808 72,577
Retainage on Construction-type Contracts [Member]    
Accounts Receivable, after Allowance for Credit Loss, Current, Total 660 687
Financing Receivable [Member]    
Financing Receivable, after Allowance for Credit Loss, Total 3,097 4,633
Financing Receivable, before Allowance for Credit Loss, Total $ 3,438 $ 5,166
Financing Receivable [Member] | Minimum [Member]    
Contract and Leases Receivable, Interest Rate 5.00%  
Financing Receivable [Member] | Maximum [Member]    
Contract and Leases Receivable, Interest Rate 9.00%