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Stock Option Activity (Detail) - $ / shares
 12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2015
Shares      
Beginning balance 1,064,150 776,500  
Granted 149,200 374,150  
Cancelled/expired (48,000) (86,500)  
Exercised 0 0  
Ending balance 1,165,350 1,064,150 776,500
Vested and exercisable 1,028,043    
Weighted Average Per Share Exercise Price      
Beginning balance $ 4.27 $ 4.69  
Granted 4.78 5.97  
Cancelled/expired 6.75 2.63  
Exercised 0 0  
Ending balance 4.24 $ 4.27 $ 4.69
Vested and exercisable $ 4.07    
Weighted Average Remaining Life (Years)      
Balance 6 years 7 months 20 days 7 years 11 months 8 days 7 years 4 months 24 days
Granted 0 years 0 years  
Cancelled/expired 0 years 0 years  
Exercised 0 years 0 years  
Vested and exercisable 6 years 4 months 10 days    
Weighted Average Per Share Intrinsic Value      
Beginning Balance $ 2.27 $ 1.50  
Granted 0 0  
Cancelled/expired 0 0  
Exercised 0 0  
Ending balance 4.86 $ 2.27 $ 1.50
Vested and exercisable $ 5.25