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Note 2 - Significant Accounting Policies - Schedule of Estimated Value of Options and Warrants (Details) | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Dividend yield | 0.00% | 0.00% | 0.00%
Expected volatility | 62.10% | 65.00% |
Risk-free interest | 1.42% |  |
Expected life (Year) | 6 years 91 days | 6 years 91 days | 6 years 91 days
Minimum [Member] |  |  |
Dividend yield |  |  |
Expected volatility |  |  | 60.00%
Risk-free interest |  | 1.94% | 1.97%
Expected life (Year) |  |  |
Maximum [Member] |  |  |
Dividend yield |  |  |
Expected volatility |  |  | 64.00%
Risk-free interest |  | 2.00% | 2.30%
Expected life (Year) |  |  |

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