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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Oct. 29, 2017	Oct. 30, 2016	Oct. 29, 2017	Oct. 30, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 3,976	$ 4,475	$ 8,959	$ 9,789
Unrealized gains on investments
Unrealized holding gains on investments	20	4	64	88
Reclassification adjustment for realized loss included in net income				12
Total other comprehensive income	20	4	64	100
Comprehensive income	$ 3,996	$ 4,479	$ 9,023	$ 9,889

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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