Note 8 - Equity - Options Outstanding and Exercisable, by Exercise Range (Details) shares in Thousands | 6 Months Ended |
Sep. 30, 2016$ / sharesshares |
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 | 114 |
Options Outstanding, Weighted-Average Remaining Contractual Life | 9 years 259 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 | 9 years 146 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) | 1.74 |
Upper Range of Exercise Price (in dollars per share) | $ 3.24 |
Options Outstanding, Number of Shares (in shares) | shares | 521 |
Options Outstanding, Weighted-Average Remaining Contractual Life | 9 years 83 days |
Options Vested, Number of Shares (in shares) | shares | 63 |
Options Vested, Weighted-Average Exercise Price per Share (in dollars per share) | $ 3.20 |
Range 4 [Member] | |
Lower Range of Exercise Price (in dollars per share) | 3.34 |
Upper Range of Exercise Price (in dollars per share) | $ 3.99 |
Options Outstanding, Number of Shares (in shares) | shares | 160 |
Options Outstanding, Weighted-Average Remaining Contractual Life | 8 years 346 days |
Options Vested, Number of Shares (in shares) | shares | 29 |
Options Vested, Weighted-Average Exercise Price per Share (in dollars per share) | $ 3.96 |
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 | 672 |
Options Outstanding, Weighted-Average Remaining Contractual Life | 8 years 284 days |
Options Vested, Number of Shares (in shares) | shares | 199 |
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 | 771 |
Options Outstanding, Weighted-Average Remaining Contractual Life | 7 years 295 days |
Options Vested, Number of Shares (in shares) | shares | 429 |
Options Vested, Weighted-Average Exercise Price per Share (in dollars per share) | $ 6.24 |
Range 7 [Member] | |
Lower Range of Exercise Price (in dollars per share) | 6.83 |
Upper Range of Exercise Price (in dollars per share) | $ 7.20 |
Options Outstanding, Number of Shares (in shares) | shares | 55 |
Options Outstanding, Weighted-Average Remaining Contractual Life | 6 years 343 days |
Options Vested, Number of Shares (in shares) | shares | 55 |
Options Vested, Weighted-Average Exercise Price per Share (in dollars per share) | $ 6.86 |
Range 8 [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 | 4 |
Options Outstanding, Weighted-Average Remaining Contractual Life | 1 year 324 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 9 [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 | 1 year 43 days |
Options Vested, Number of Shares (in shares) | shares | 1 |
Options Vested, Weighted-Average Exercise Price per Share (in dollars per share) | $ 18.90 |
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 | 4,298 |
Options Outstanding, Weighted-Average Remaining Contractual Life | 8 years 346 days |
Options Vested, Number of Shares (in shares) | shares | 781 |
Options Vested, Weighted-Average Exercise Price per Share (in dollars per share) | $ 5.50 |