Note 7 - Exercise Price Range Relating to Oustanding and Exercisable Options (Details) | 3 Months Ended |
Sep. 30, 2015$ / sharesshares |
Range One [Member] | |
Exercise Price Range, Lower Limit (in dollars per share) | $ 1.95 |
Exercise Price Range, Upper Limit (in dollars per share) | $ 2.45 |
Outstanding, Number of Shares (in shares) | shares | 1,399,500 |
Outstanding, Weighted Average Remaining Contractual Life | 8 years 343 days |
Outstanding, Weighted Average Exercise Price (in dollars per share) | $ 2.39 |
Exercisable, Number of Shares (in shares) | shares | 45,000 |
Exercisable, Weighted Average Exercise Price (in dollars per share) | $ 2.26 |
Range Two [Member] | |
Exercise Price Range, Lower Limit (in dollars per share) | 2.47 |
Exercise Price Range, Upper Limit (in dollars per share) | $ 2.85 |
Outstanding, Number of Shares (in shares) | shares | 1,317,500 |
Outstanding, Weighted Average Remaining Contractual Life | 6 years 251 days |
Outstanding, Weighted Average Exercise Price (in dollars per share) | $ 2.55 |
Exercisable, Number of Shares (in shares) | shares | 144,168 |
Exercisable, Weighted Average Exercise Price (in dollars per share) | $ 2.75 |
Range Three [Member] | |
Exercise Price Range, Lower Limit (in dollars per share) | 3.14 |
Exercise Price Range, Upper Limit (in dollars per share) | $ 4.07 |
Outstanding, Number of Shares (in shares) | shares | 1,166,590 |
Outstanding, Weighted Average Remaining Contractual Life | 7 years 76 days |
Outstanding, Weighted Average Exercise Price (in dollars per share) | $ 4.04 |
Exercisable, Number of Shares (in shares) | shares | 763,561 |
Exercisable, Weighted Average Exercise Price (in dollars per share) | $ 4.05 |
Range Four [Member] | |
Exercise Price Range, Lower Limit (in dollars per share) | 4.15 |
Exercise Price Range, Upper Limit (in dollars per share) | $ 39.60 |
Outstanding, Number of Shares (in shares) | shares | 519,694 |
Outstanding, Weighted Average Remaining Contractual Life | 4 years 299 days |
Outstanding, Weighted Average Exercise Price (in dollars per share) | $ 18.90 |
Exercisable, Number of Shares (in shares) | shares | 363,444 |
Exercisable, Weighted Average Exercise Price (in dollars per share) | $ 24.94 |
Outstanding, Number of Shares (in shares) | shares | 4,403,284 |
Outstanding, Weighted Average Remaining Contractual Life | 7 years 116 days |
Outstanding, Weighted Average Exercise Price (in dollars per share) | $ 4.83 |
Exercisable, Number of Shares (in shares) | shares | 1,316,173 |
Exercisable, Weighted Average Exercise Price (in dollars per share) | $ 9.61 |