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Note 7 - Share-based Compensation (Details) - Weighted Average Assumptions (USD $)
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12 Months Ended | ||
|---|---|---|---|
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Dec. 31, 2014
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Dec. 31, 2013
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Dec. 31, 2012
|
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| Weighted Average Assumptions [Abstract] | |||
| Weighted average grant-date fair value per stock option $US (in Dollars per share) | $ 1.24 | $ 1.26 | $ 3.41 |
| Expected volatility | 78.67% | 86.53% | 84.68% |
| Risk-free interest rate | 1.65% | 1.90% | 0.89% |
| Expected life of options in years | 5 years 299 days | 6 years | 6 years |