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Note 7 - Receivables (Details Textual) - USD ($) $ in Thousands	9 Months Ended
	Jan. 30, 2021	May 02, 2020
Accounts Receivable, Allowance for Credit Loss, Current	$ 4,160	$ 2,828
Accounts Receivable, after Allowance for Credit Loss, Current, Total	63,212	72,577
Retainage on Construction-type Contracts [Member]
Accounts Receivable, after Allowance for Credit Loss, Current, Total	1,219	687
Financing Receivable [Member]
Financing Receivable, after Allowance for Credit Loss, Total	2,490	4,633
Financing Receivable, before Allowance for Credit Loss, Total	$ 2,618	$ 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%

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- Definition

The interest rate of contract and leases receivable.

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