Segment Data (Details) - USD ($) $ in Thousands	3 Months Ended
Jul. 29, 2017	Jul. 30, 2016
Segment Data
Revenue	$ 43,764	$ 36,218
Cost of sales	32,134	29,535
Total gross margin	11,630	6,683
Selling, general and administrative	13,331	13,663
Research and development	6,461	8,600
Loss from operations	(8,162)	(15,580)
Interest income, net	512	375
Other income (expense), net	4	(300)
Loss before income taxes	(7,646)	(15,505)
Inter-segment and corporate elimination
Segment Data
Revenue	0	0
UAS
Segment Data
Revenue	36,250	30,497
Cost of sales	26,408	25,083
Total gross margin	9,842	5,414
EES
Segment Data
Revenue	7,514	5,721
Cost of sales	5,726	4,452
Total gross margin	$ 1,788	$ 1,269

The aggregate cost of goods produced and sold and services rendered during the reporting period.

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Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest.

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Amount before accretion (amortization) of purchase discount (premium) of interest income on nonoperating securities.

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The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use.

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The aggregate total costs related to selling a firm's product and services, as well as all other general and administrative expenses. Direct selling expenses (for example, credit, warranty, and advertising) are expenses that can be directly linked to the sale of specific products. Indirect selling expenses are expenses that cannot be directly linked to the sale of specific products, for example telephone expenses, Internet, and postal charges. General and administrative expenses include salaries of non-sales personnel, rent, utilities, communication, etc.

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