Condensed Consolidated Balance Sheets (USD $)	Jan. 25, 2013	Apr. 27, 2012
Current Assets:
Cash and cash equivalents	$ 116,531,170	$ 96,654,275
Short-term investments	15,000,000
Accounts receivable, net	35,690,855	29,266,847
Inventories	17,427,845	14,385,875
Deferred tax assets	5,988,392	16,994,209
Other current assets	3,113,665	3,801,705
Total Current Assets	193,751,927	161,102,911
Property, plant and equipment, net	25,878,293	22,160,671
Intangible assets, net	6,376,383	4,509,612
Long-term investments	8,038,200	9,508,768
Deferred tax assets	15,958,202	14,265,574
Other assets	407,282	360,659
Total Assets	250,410,287	211,908,195
Current Liabilities:
Accounts payable	4,562,331	4,886,448
Accrued liabilities	17,095,866	18,146,188
Convertible notes	0	4,000
Total Current Liabilities	21,658,197	23,036,636
Long-term liabilities	4,359,870	5,402,189
Total Liabilities	26,018,067	28,438,825
Commitments and Contingencies
Stockholders' Equity:
Preferred Stock, $.01 par value per share; 2,500,000 shares authorized; no shares issued and outstanding	0	0
Common Stock, $.01 par value per share; 50,000,000 shares authorized; 31,238,945 shares issued and 27,701,851 shares outstanding at January 25, 2013 and 30,638,605 shares issued and 27,529,320 shares outstanding at April 27, 2012	312,389	306,386
Additional paid-in capital	373,298,174	321,960,886
Common stock warrants		25,200,000
Treasury stock, 3,537,094 and 3,109,285 common shares at January 25, 2013 and April 27, 2012, respectively, at cost	(103,256,693)	(83,151,212)
Accumulated other comprehensive income	481,410	421,801
Accumulated deficit	(46,443,060)	(81,268,491)
Total Stockholders' Equity	224,392,220	183,469,370
Total Liabilities and Stockholders' Equity	$ 250,410,287	$ 211,908,195