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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 Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121593590&loc=d3e4428-111522 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(3)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121566466&loc=d3e6676-107765 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=121593590&loc=d3e4531-111522 + Details
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