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Income Taxes (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	May 31, 2013	May 31, 2012
State income taxes and changes in deferred tax assets valuation allowance
Income taxes at statutory federal rate	$ (3,574)	$ (6,584)
State income taxes	93	(47)
State net operating loss	(605)	(1,047)
New Energy Efficient Home Credit	(91)	(117)
Alternative Fuel Credit		(12)
Other federal credits		(7)
Increase in deferred tax assets valuation allowance	4,189	7,436
Other, net	(12)	378
Income tax benefit
Effective tax rate	0.00%	0.00%

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