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Note 13 - Cash Flow Information - Changes in Operating Assets and Liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	May 01, 2021	May 02, 2020	Apr. 27, 2019
Account receivable	$ 4,864	$ (7,461)	$ 10,856
Long-term receivables	1,737	(1,173)	329
Inventories	13,900	(8,347)	(4,076)
Contract assets	3,080	(1,931)	(3,040)
Prepaid expenses and other current assets	2,450	(1,403)	472
Income taxes receivables	(148)	533	4,250
Investment in affiliates and other assets	744	(3,137)	48
Accounts payable	(7,081)	2,377	(2,747)
Contract liabilities	12,628	4,548	10,774
Accrued expenses	(2,936)	6,745	4,631
Warranty obligations	696	273	(4,393)
Long-term warranty obligations	(367)	883	(1,079)
Income taxes payable	(173)	390	(3,023)
Long-term marketing obligations and other payables	2,337	(387)	(1,116)
Change in operating assets and liabilities	$ 31,731	$ (8,090)	$ 11,886

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- Definition

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The increase (decrease) during the reporting period in the aggregate amount of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business.

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The increase (decrease) during the reporting period in amount due within one year (or one business cycle) from customers for the credit sale of goods and services.

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The increase (decrease) during the period in the amount due for taxes based on the reporting entity's earnings or attributable to the entity's income earning process (business presence) within a given jurisdiction.

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The increase (decrease) during the reporting period in the aggregate amount of expenses incurred but not yet paid.

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Amount of increase (decrease) in right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time.

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The increase (decrease) during the reporting period in income taxes receivable, which represents the amount due from tax authorities for refunds of overpayments or recoveries of income taxes paid.

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