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Stock Option Activity (Detail) - $ / shares
 3 Months Ended 12 Months Ended
Jun. 30, 2017
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2015
Shares        
Beginning balance 1,165,350 1,064,150 776,500  
Granted 80,000 149,200 374,150  
Exercised 0 0 0  
Cancelled/expired (32,222) (48,000) (86,500)  
Ending balance 1,213,128 1,165,350 1,064,150 776,500
Vested and exercisable 1,041,257 1,028,043    
Weighted Average Per Share Exercise Price        
Beginning balance $ 4.24 $ 4.27 $ 4.69  
Granted 9.71 4.78 5.97  
Exercised 0 0 0  
Cancelled/expired 9.71 6.75 2.63  
Ending balance 4.42 4.24 $ 4.27 $ 4.69
Vested and exercisable $ 4.04 $ 4.07    
Weighted Average Remaining Life (Years)        
Balance 6 years 7 months 10 days 6 years 7 months 20 days 7 years 11 months 8 days 7 years 4 months 24 days
Granted 0 years 0 years 0 years  
Exercised 0 years 0 years 0 years  
Cancelled/expired 0 years 0 years 0 years  
Vested and exercisable 6 years 2 months 5 days 6 years 4 months 10 days    
Weighted Average Per Share Intrinsic Value        
Beginning Balance $ 4.86 $ 2.27 $ 1.50  
Granted 0 0 0  
Exercised 0 0 0  
Cancelled/expired 0 0 0  
Ending balance 5.57 4.86 $ 2.27 $ 1.50
Vested and exercisable $ 5.96 $ 5.25