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Acquisition - Additional Information (Detail) - USD ($)
 3 Months Ended 12 Months Ended
Apr. 30, 2016
Jan. 31, 2016
Business Acquisition [Line Items]    
Fair value assumptions, Weighted average cost of capital 15.50%  
Fair value key assumptions Key assumptions include (1) a weighted average cost of capital of 15.5%; (2) a range of earnings projections from $110,000-$700,000 and (3) a range of contract renewal probability from 30%-100%.  
Minimum [Member]    
Business Acquisition [Line Items]    
Fair value assumptions, Earnings projections $ 110,000  
Fair value assumptions, Contract renewal probability 30.00%  
Maximum [Member]    
Business Acquisition [Line Items]    
Fair value assumptions, Earnings projections $ 700,000  
Fair value assumptions, Contract renewal probability 100.00%  
RITEC [Member]    
Business Acquisition [Line Items]    
Completion date of acquisition Jun. 19, 2015  
Date of asset purchase agreement Jun. 18, 2015  
Purchase price of the acquisition $ 7,360,000  
Amount held in escrow related to business acquisition $ 750,000  
Duration of escrow deposits 12 months  
General and administrative expenses   $ 109,000
Estimated inventory purchase $ 150,000  
Percentage of royalties on sale price of products 7.50%  
Initial royalty payment period 5 years  
Goodwill deductible for tax purposes $ 3,530,000