Note 8 - Equity - Options Outstanding and Exercisable, By Exercise Range (Details) shares in Thousands | 9 Months Ended |
Dec. 31, 2016$ / sharesshares |
Lower Range of Exercise Price (in dollars per share) | $ 1.35 |
Upper Range of Exercise Price (in dollars per share) | $ 18.90 |
Options Outstanding, Number of Shares (in shares) | shares | 4,472 |
Options Outstanding, Weighted-Average Remaining Contractual Life (Year) | 8 years 288 days |
Options Vested, Number of Shares (in shares) | shares | 912 |
Options Vested, Weighted-Average Exercise Price per Share (in dollars per share) | $ 5.33 |
Range 1 [Member] | |
Lower Range of Exercise Price (in dollars per share) | 1.35 |
Upper Range of Exercise Price (in dollars per share) | $ 1.35 |
Options Outstanding, Number of Shares (in shares) | shares | 106 |
Options Outstanding, Weighted-Average Remaining Contractual Life (Year) | 9 years 164 days |
Options Vested, Number of Shares (in shares) | shares | |
Options Vested, Weighted-Average Exercise Price per Share (in dollars per share) | |
Range 2 [Member] | |
Lower Range of Exercise Price (in dollars per share) | 1.64 |
Upper Range of Exercise Price (in dollars per share) | $ 1.64 |
Options Outstanding, Number of Shares (in shares) | shares | 2,000 |
Options Outstanding, Weighted-Average Remaining Contractual Life (Year) | 9 years 54 days |
Options Vested, Number of Shares (in shares) | shares | |
Options Vested, Weighted-Average Exercise Price per Share (in dollars per share) | |
Range 3 [Member] | |
Lower Range of Exercise Price (in dollars per share) | 1.80 |
Upper Range of Exercise Price (in dollars per share) | $ 2 |
Options Outstanding, Number of Shares (in shares) | shares | 578 |
Options Outstanding, Weighted-Average Remaining Contractual Life (Year) | 9 years 222 days |
Options Vested, Number of Shares (in shares) | shares | 22 |
Options Vested, Weighted-Average Exercise Price per Share (in dollars per share) | $ 1.83 |
Range 4 [Member] | |
Lower Range of Exercise Price (in dollars per share) | 3.24 |
Upper Range of Exercise Price (in dollars per share) | $ 3.99 |
Options Outstanding, Number of Shares (in shares) | shares | 318 |
Options Outstanding, Weighted-Average Remaining Contractual Life (Year) | 8 years 255 days |
Options Vested, Number of Shares (in shares) | shares | 128 |
Options Vested, Weighted-Average Exercise Price per Share (in dollars per share) | $ 3.46 |
Range 5 [Member] | |
Lower Range of Exercise Price (in dollars per share) | 4.32 |
Upper Range of Exercise Price (in dollars per share) | $ 4.32 |
Options Outstanding, Number of Shares (in shares) | shares | 655 |
Options Outstanding, Weighted-Average Remaining Contractual Life (Year) | 8 years 208 days |
Options Vested, Number of Shares (in shares) | shares | 233 |
Options Vested, Weighted-Average Exercise Price per Share (in dollars per share) | $ 4.32 |
Range 6 [Member] | |
Lower Range of Exercise Price (in dollars per share) | 5.18 |
Upper Range of Exercise Price (in dollars per share) | $ 6.61 |
Options Outstanding, Number of Shares (in shares) | shares | 754 |
Options Outstanding, Weighted-Average Remaining Contractual Life (Year) | 7 years 193 days |
Options Vested, Number of Shares (in shares) | shares | 468 |
Options Vested, Weighted-Average Exercise Price per Share (in dollars per share) | $ 6.25 |
Range 7 [Member] | |
Lower Range of Exercise Price (in dollars per share) | 6.83 |
Upper Range of Exercise Price (in dollars per share) | $ 6.83 |
Options Outstanding, Number of Shares (in shares) | shares | 50 |
Options Outstanding, Weighted-Average Remaining Contractual Life (Year) | 7 years 51 days |
Options Vested, Number of Shares (in shares) | shares | 50 |
Options Vested, Weighted-Average Exercise Price per Share (in dollars per share) | $ 6.83 |
Range 8 [Member] | |
Lower Range of Exercise Price (in dollars per share) | 7.20 |
Upper Range of Exercise Price (in dollars per share) | $ 7.20 |
Options Outstanding, Number of Shares (in shares) | shares | 5 |
Options Outstanding, Weighted-Average Remaining Contractual Life (Year) | 2 years 58 days |
Options Vested, Number of Shares (in shares) | shares | 5 |
Options Vested, Weighted-Average Exercise Price per Share (in dollars per share) | $ 7.20 |
Range 9 [Member] | |
Lower Range of Exercise Price (in dollars per share) | 11.40 |
Upper Range of Exercise Price (in dollars per share) | $ 11.40 |
Options Outstanding, Number of Shares (in shares) | shares | 5 |
Options Outstanding, Weighted-Average Remaining Contractual Life (Year) | 1 year 233 days |
Options Vested, Number of Shares (in shares) | shares | 5 |
Options Vested, Weighted-Average Exercise Price per Share (in dollars per share) | $ 11.40 |
Range 10 [Member] | |
Lower Range of Exercise Price (in dollars per share) | 18.90 |
Upper Range of Exercise Price (in dollars per share) | $ 18.90 |
Options Outstanding, Number of Shares (in shares) | shares | 1 |
Options Outstanding, Weighted-Average Remaining Contractual Life (Year) | 317 days |
Options Vested, Number of Shares (in shares) | shares | 1 |
Options Vested, Weighted-Average Exercise Price per Share (in dollars per share) | $ 18.90 |