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Marketable Securities - Available-for-sale Securities (Details) - USD ($) $ in Thousands	Jan. 28, 2017	Apr. 30, 2016
Schedule of Available-for-sale Securities
Amortized Cost	$ 28,057	$ 24,671
Unrealized Gains	0	2
Unrealized Losses	(23)	(1)
Fair Value	28,034	24,672
Certificates of deposit
Schedule of Available-for-sale Securities
Amortized Cost	13,076	14,927
Unrealized Gains	0	0
Unrealized Losses	0	0
Fair Value	13,076	14,927
U.S. Government securities
Schedule of Available-for-sale Securities
Amortized Cost	400
Unrealized Gains	0
Unrealized Losses	0
Fair Value	400
U.S. Government sponsored entities
Schedule of Available-for-sale Securities
Amortized Cost	7,666	8,523
Unrealized Gains	0	0
Unrealized Losses	(22)	(1)
Fair Value	7,644	8,522
Municipal obligations
Schedule of Available-for-sale Securities
Amortized Cost	6,915	1,221
Unrealized Gains	0	2
Unrealized Losses	(1)	0
Fair Value	$ 6,914	$ 1,223

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+ References

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
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Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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