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Stock Option Plan and Stock Based Compensation - Stock Option Activity (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 6 Months Ended
Feb. 28, 2015
Aug. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]    
Number of Shares, Options Outstanding, Beginning Balance   374,823
Number of Shares, Granted   43,426
Number of Shares, Terminated   (20,000)
Number of Shares, Exercised   0
Number of Shares, Options Outstanding, Ending Balance 374,823 398,249
Weighted Average Exercise Price, Beginning Balance   $ 15.95
Weighted Average Exercise Price, Granted   13.69
Weighted Average Exercise Price, Terminated   16.42
Weighted Average Exercise Price, Exercised   0
Weighted Average Exercise Price, Ending Balance $ 15.95 $ 15.68
Weighted Average Remaining Contractual Life, Ending Balance 5 years 8 months 12 days 6 years
Aggregate Intrinsic Value, Beginning Balance   $ 210
Aggregate Intrinsic Value, Ending Balance $ 210 $ 587
Number of Shares, Exercisable   321,824
Weighted Average Exercise Price, Exercisable   $ 16.00
Weighted Average Remaining Contractual Life, Exercisable   5 years 2 months 12 days
Aggregate Intrinsic Value, Exercisable   $ 433