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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, 2017	May 31, 2016
Income Tax Disclosure [Abstract]
Income taxes at statutory federal rate	$ 2	$ 637
Income taxes on permanent differences	215	167
State income taxes	38	199
State net operating loss	104	252
New Energy Efficient Home Credit	(142)	(237)
Decrease in deferred tax assets valuation allowance	(348)	(1,031)
Other, net	131	13
Income tax expense	$ 0	$ 0
Effective tax rate	0.00%	0.00%

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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