Note 11 - Employee Equity Incentive Plans - Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended
		Jun. 30, 2016	Mar. 31, 2016
Options outstanding, beginning of period (in shares)		5,234,397
Weighted average exercise price per share, beginning balance (in dollars per share)		$ 10.40
Options oustanding, Options granted (in shares)		222,000
Weighted average exercise price per share, Options granted (in dollars per share)		$ 10.97
Options oustanding, Options exercised (in shares)		(27,897)
Weighted average exercise price per share, Options exercised (in dollars per share)		$ 6.53
Options exercised, Intrinsic Value	[1]	$ 130
Options oustanding, Options expired (in shares)		(5,000)
Weighted average exercise price per share, Options expired (in dollars per share)		$ 9.73
Options oustanding, ending balance (in shares)		5,423,500
Weighted average exercise price per share, ending balance (in dollars per share)		$ 10.44
Options exercisable (in shares)		3,684,916	3,619,563
Weighted average exercise price per share, exercisable (in dollars per share)		$ 10.03	$ 9.93

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