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Total Unrecognized Compensation Costs Related To Non-Vested Stock-Based Compensation Arrangements (Detail) (USD $)
6 Months Ended
Jul. 31, 2013
Common stock options
 
Employee Service Share -Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized [Line Items]  
Unrecognized compensation cost $ 310,959
Weighted Average Remaining Life (Years) 1 year 1 month 6 days
ACO Plan restricted stock
 
Employee Service Share -Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized [Line Items]  
Unrecognized compensation cost $ 18,850
Weighted Average Remaining Life (Years) 1 year 6 months