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Income Taxes - State Income Taxes and Changes in Deferred Tax Assets Valuation Allowance (Detail) - USD ($) $ in Thousands	12 Months Ended
	May. 31, 2015	May. 31, 2014
Income Tax Disclosure [Abstract]
Income taxes at statutory federal rate	$ (1,424)	$ (2,484)
State income taxes	(45)	14
State net operating loss	(110)	(296)
New Energy Efficient Home Credit	(134)	(137)
Increase in deferred tax assets valuation allowance	1,570	2,862
Other, net	143	41
Income tax benefit	$ 0	$ 0
Effective tax rate	0.00%	0.00%

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