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Note 1 - Nature of Business and Summary of Significant Accounting Policies - Equity Method Investments (Details) - USD ($) $ in Thousands	12 Months Ended
	May 01, 2021	May 02, 2020	Apr. 27, 2019
Current assets	$ 265,003	$ 252,002
Current liabilities	146,620	145,965
Non-current liabilities	34,990	49,706
Basic earnings per share, net income (loss)	10,926	491	$ (958)
Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member]
Current assets	7,534	10,593	192
Non-current assets	4,637	4,266	2,626
Current liabilities	2,807	2,755	839
Non-current liabilities	1,793	4,086	2,599
Basic earnings per share, net income (loss)	$ (13,436)	$ (1,383)	$ (2,168)

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