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Income Taxes - Schedule of Provision (Benefit) for Income Taxes Continuing Operations (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Apr. 30, 2014
Apr. 30, 2013
Apr. 30, 2012
Federal      
Current     $ 121
Deferred 1,262 (2,827) 1,468
Deferred benefit of loss carryforwards         
Total 1,262 (2,827) 1,589
State      
Current 219 1,040 (352)
Current benefit of loss carryforwards   (22)  
Deferred 318 (717) 372
Deferred benefit of loss carryforwards     (16)
Total 537 301 4
Income before provision (benefit) for income tax, net $ 1,799 $ (2,526) $ 1,593