Note 11 - Employee Equity Incentive Plans - Option Activity (Details) - USD ($) $ in Thousands		3 Months Ended	9 Months Ended
		Dec. 31, 2015	Dec. 31, 2015	Mar. 31, 2015
Options outstanding, beginning of period (in shares)			4,942,511
Options outstanding, beginning of period (in dollars per share)			$ 10.37
Options granted (in shares)		0	1,124,000
Options granted (in dollars per share)			$ 11.72
Options exercised (in shares)			(369,826)
Options exercised (in dollars per share)			$ 9.11
Options exercised, Intrinsic Value	[1]		$ 1,484
Options cancelled (in shares)			(2,500)
Options cancelled (in dollars per share)			$ 12.13
Options expired (in shares)			(434,788)
Options expired (in dollars per share)			$ 14.68
Options outstanding, end of period (in shares)		5,259,397	5,259,397
Options outstanding, end of period (in dollars per share)		$ 10.39	$ 10.39
Options exercisable (in shares)		3,499,063	3,499,063	3,942,261
Options exercisable (in dollars per share)		$ 9.88	$ 9.88	$ 10.20

[1] Represents the difference between the exercise price and the value of our common stock at the time of exercise.