4. PROPERTY AND EQUIPMENT (Tables)

6 Months Ended

Oct. 31, 2013

Property, Plant and Equipment [Abstract]

PROPERTY AND EQUIPMENT

	October 31, 2013			April 30, 2013
Leasehold improvements	$	1,453,000		$	1,383,000
Laboratory equipment		5,493,000			5,441,000
Furniture, fixtures, office equipment and software		2,635,000			2,627,000
		9,581,000			9,451,000
Less accumulated depreciation and amortization		(7,266,000	)		(6,773,000	)
Property and equipment, net	$	2,315,000		$	2,678,000