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Investments (Schedule of Long-term Investments) (Details)	3 Months Ended		6 Months Ended
	Oct. 18, 2015 USD ($) company	Oct. 24, 2014 USD ($)	Oct. 18, 2015 USD ($) company	Oct. 24, 2014 USD ($)	Apr. 24, 2015 USD ($)
Schedule of Cost-method Investments [Line Items]
Number of privately-held companies invested in | company	2		2
Carrying amount - long-term investments	$ 15,062,643		$ 15,062,643		$ 17,126,927
Loss from impairment of investment	0	$ 0	2,064,283	$ 0
ImThera Medical Inc [Member]
Schedule of Cost-method Investments [Line Items]
Carrying amount - long-term investments	12,000,002		12,000,002		12,000,002
Cerbomed GMBH [Member]
Schedule of Cost-method Investments [Line Items]
Carrying amount - long-term investments	$ 3,062,641		$ 3,062,641		$ 5,126,925

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The amount of other than temporary impairment (OTTI) losses on equity securities, OTTI related to credit losses on debt securities, and OTTI losses on debt securities when the entity intends to sell the securities or it is more likely than not that the entity will be required to sell the securities before recovery of its amortized cost basis. Additionally, this item includes OTTI losses recognized during the period on investments accounted for under the cost method of accounting.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 320



-SubTopic 10



-Section 50



-Paragraph 8B



-URI http://asc.fasb.org/extlink&oid=27724398&loc=SL6284393-111563

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