Stock Option Activity (Detail) - $ / shares	12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014
Shares
Beginning balance	776,500	628,700
Granted	374,150	162,000
Cancelled/expired	(86,500)	(14,200)
expired	0	0
Ending balance	1,064,150	776,500	628,700
Vested and exercisable	814,802
Weighted Average Per Share Exercise Price
Beginning balance	$ 4.69	$ 2
Granted	5.97	10.00
Cancelled/expired	2.63	0
Exercised	0	0
Ending balance	4.27	$ 4.69	$ 2
Vested and exercisable	$ 2.67
Weighted Average Remaining Life (Years)
Balance	7 years 11 months 8 days	7 years 4 months 24 days	8 years 8 months 12 days
Vested and exercisable	6 years 11 months 26 days
Weighted Average Per Share Intrinsic Value
Beginning Balance	$ 1.5	$ 1.1
Ending balance	2.27	$ 1.5	$ 1.1
Vested and exercisable	$ 3.84