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Consolidated Statements of Comprehensive Income (Loss) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Oct. 31, 2014	Oct. 31, 2013	Oct. 31, 2014	Oct. 31, 2013
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 361	$ (575)	$ 207	$ (738)
Other comprehensive income (loss), net of tax:
Unrealized loss resulting from changes in fair value of derivative instruments		(279)		(568)
Realized loss on derivative instruments reclassified into earnings		181		345
Unrealized (loss) gain resulting from changes in fair value of marketable securities	(6)	18	6	18
Other comprehensive (loss) income, net of tax	(6)	(80)	6	(205)
Comprehensive income (loss)	355	(655)	213	(943)
Less: Comprehensive income (loss) attributable to noncontrolling interests	102	(236)	238	(207)
Comprehensive income (loss) attributable to common stockholders	$ 253	$ (419)	$ (25)	$ (736)

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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