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Note 6 - Fair Value Measurement and Financial Instruments (Details) - Fair Value Assumptions, Stock-based Compensation Liability (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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| Note 6 - Fair Value Measurement and Financial Instruments (Details) - Fair Value Assumptions, Stock-based Compensation Liability [Line Items] | ||
| Stock price at the end of each reporting period | $ 0.54 | $ 3.70 |
| Stock-based Compensation Liability [Member] | ||
| Note 6 - Fair Value Measurement and Financial Instruments (Details) - Fair Value Assumptions, Stock-based Compensation Liability [Line Items] | ||
| Stock price at the end of each reporting period | $ 0.54 | $ 3.70 |
| Weighted average exercise price | $ 15.83 | $ 17.66 |
| Risk-free interest rate | 0.88% | 1.00% |
| Volatility | 138.38% | 94.53% |
| Dividend yield | 0.00% | 0.00% |
| Expected life in years | 2 years 178 days | 3 years 153 days |
| Calculated fair value per stock option | $ 0.10 | $ 1.17 |