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Note 6 - Equity Incentive Plan and Stock-Based Compensation (Details) - Weighted Average Fair Value of Stock Options Granted (USD $)
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3 Months Ended | 6 Months Ended |
|---|---|---|
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Jun. 30, 2013
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Jun. 30, 2013
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| Weighted Average Fair Value of Stock Options Granted [Abstract] | ||
| Weighted average fair value of stock options granted | $ 4.48 | $ 4.88 |