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Note 3 - Fair Value Measurements (Details) - Estimated Fair Value of Warrants Accounted for as Liabilities (USD $)
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12 Months Ended |
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Dec. 31, 2014
|
Dec. 31, 2013
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| Fair Value Inputs, Liabilities, Quantitative Information [Line Items] |
|
|
| Market value of stock at end of period (in Dollars per share) |
$ 1.90 |
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| September 2010 Warrants [Member] |
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|
| Fair Value Inputs, Liabilities, Quantitative Information [Line Items] |
|
|
| Exercise price (in Dollars per share) |
$ 4.24 |
$ 4.24 |
| Market value of stock at end of period (in Dollars per share) |
$ 1.90 |
$ 1.76 |
| Expected dividend rate |
0.00% |
0.00% |
| Expected volatility |
60.30% |
77.40% |
| Risk-free interest rate |
0.20% |
0.30% |
| Expected life (in years) |
284 days |
1 year 284 days |
| May 2009 Warrants [Member] |
|
|
| Fair Value Inputs, Liabilities, Quantitative Information [Line Items] |
|
|
| Exercise price (in Dollars per share) |
|
$ 3.74 |
| Market value of stock at end of period (in Dollars per share) |
|
$ 1.76 |
| Expected dividend rate |
|
0.00% |
| Expected volatility |
|
45.30% |
| Risk-free interest rate |
|
0.10% |
| Expected life (in years) |
|
146 days |