Intangible Assets (Schedule of Finite-Lived Intangible Assets) (Details) (USD $)	12 Months Ended
	Apr. 26, 2013		Apr. 27, 2012
Finite-Lived Intangible Assets [Line Items]
Beginning balance - gross carrying amount	$ 5,785,000		$ 5,844,401
Acquisitions	5,578,000		500,000
Impairments			559,401	[1]
Ending balance - gross carrying amount	11,363,000		5,785,000
Accumulated amortization	(2,143,001)		(1,275,388)	[1]
Net	9,219,999		4,509,612
Write-off of accumulated amortization			76,800
Developed Technology Rights [Member]
Finite-Lived Intangible Assets [Line Items]
Beginning balance - gross carrying amount	5,660,000	[2]	5,370,000	[2]
Acquisitions	4,710,000	[2]	500,000	[2]
Impairments			210,000	[1],[2]
Ending balance - gross carrying amount	10,370,000	[2]	5,660,000	[2]
Accumulated amortization	(2,094,620)	[2]	(1,259,764)	[1],[2]
Net	8,275,380	[2]	4,400,236	[2]
License Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Beginning balance - gross carrying amount			474,401	[3]
Impairments			349,401	[1],[3]
Ending balance - gross carrying amount	125,000	[3]	125,000	[3]
Accumulated amortization	(29,379)	[3]	(15,624)	[1],[3]
Net	95,621	[3]	109,376	[3]
Other Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Acquisitions	868,000	[4]
Ending balance - gross carrying amount	868,000	[4]
Accumulated amortization	(19,002)	[4]
Net	$ 848,998	[4]

[1] The intangible assets impaired during the year ended April 27, 2012 were primarily related to chip architecture written-off after the assets were determined to no longer factor into our product plans. We wrote off the related accumulated amortization of $76,800.

[2] Developed Technology Rights include acquired exclusive licenses and know-how. These assets have finite lives and relate primarily to seizure detection algorithms, wireless communication technology, rechargeable battery technology and an implantable lead with MRI compatibility.

[3] License Agreements include non-exclusive technology licenses primarily related to chip architecture for the detection and processing of heart signals.

[4] Other Intangible Assets primarily consists of clinical databases acquired from the NeuroVista bankruptcy, see “Note 6. Investments” for further details.