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Income Taxes - State Income Taxes and Changes in Deferred Tax Assets Valuation Allowance (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	May 31, 2014	May 31, 2013
Income Tax Disclosure [Abstract]
Income taxes at statutory federal rate	$ (4,034)	$ (3,574)
State income taxes	23	93
State net operating loss	(480)	(605)
New Energy Efficient Home Credit	(137)	(91)
Increase in deferred tax assets valuation allowance	4,561	4,189
Other, net	67	(12)
Income tax benefit	$ 0	$ 0
Effective tax rate	0.00%	0.00%

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