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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, 2016
May 31, 2015
Income Tax Disclosure [Abstract]    
Income taxes at statutory federal rate $ 637 $ (1,424)
State income taxes 199 (45)
State net operating loss 252 (110)
New Energy Efficient Home Credit (237) (134)
(Decrease) increase in deferred tax assets valuation allowance (1,031) 1,570
Other, net 180 143
Income tax expense $ 0 $ 0
Effective tax rate 0.00% 0.00%