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Note 7 - Shareholders' Equity (Details) - Weighted Average Assumptions Used to Value Restricted Stock Units Granted | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012
Note 7 - Shareholders' Equity (Details) - Weighted Average Assumptions Used to Value Restricted Stock Units Granted [Line Items] |  |
Risk-free interest rate | 0.78% | 0.56%
Volatility factor | 61.94% | 63.53%
Dividends | 0.00% | 0.00%
Restricted Stock Units (RSUs) [Member] |  |
Note 7 - Shareholders' Equity (Details) - Weighted Average Assumptions Used to Value Restricted Stock Units Granted [Line Items] |  |
Risk-free interest rate | 0.21% |
Volatility factor | 59.08% |
Dividends | 0.00% |

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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iv) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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