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Note 1 - Nature of Business and Summary of Significant Accounting Policies (Tables)

12 Months Ended

May 01, 2021

Notes Tables

Equity Method Investments [Table Text Block]

		Year Ended
		May 1, 2021				May 2, 2020				April 27, 2019
Balance sheet data:
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
Income statement data:
Net loss			(13,436	)			(1,383	)			(2,168	)

Schedule of Cash and Cash Equivalents [Table Text Block]

		May 1, 2021				May 2, 2020				April 27, 2019
Cash and cash equivalents		$	77,590			$	40,398			$	35,383
Restricted cash			2,812				14				359
Total cash, cash equivalents, and restricted cash shown in the consolidated statements of cash flows		$	80,402			$	40,412			$	35,742

Property, Plant and Equipment, Estimated Useful Life [Table Text Block]

		Years
Buildings and improvements		5 - 40
Machinery and equipment		5 - 7
Office furniture and equipment		3 - 5
Computer software and hardware		3 - 5
Equipment held for rental		2 - 7
Demonstration equipment		3 - 5
Transportation equipment		5 - 7

Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]

		Net income (loss)				Shares				Per share income (loss)
For the year ended May 1, 2021:
Basic earnings per share		$	10,926				44,989			$	0.24
Dilution associated with stock compensation plans			—				213				—
Diluted earnings per share		$	10,926				45,202			$	0.24
For the year ended May 2, 2020:
Basic earnings per share		$	491				45,031			$	0.01
Dilution associated with stock compensation plans			—				285				—
Diluted earnings per share		$	491				45,316			$	0.01
For the year ended April 27, 2019:
Basic loss per share		$	(958	)			44,926			$	(0.02	)
Dilution associated with stock compensation plans			—				—				—
Diluted loss per share		$	(958	)			44,926			$	(0.02	)

Accounts Receivable, Allowance for Credit Loss [Table Text Block]

		Allowance
		for Doubtful
		Accounts:
Balance as of May 2, 2020		$	2,828
Charged to costs and expenses			3,318
Deductions (1)			(2,204	)
Balance as of May 1, 2021		$	3,942

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