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Note 6 - Equity Incentive Plan (Tables) | 6 Months Ended
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Jun. 30, 2016
Notes Tables |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
|  | Six Months Ended June 30,
|  | 2016 |  | 2015
Risk free interest rate |  | 0.94% | - | 1.40% |  | 1.15% | - | 1.46%
Expected volatility |  | 49.47% | - | 51.61% |  | 53.15% | - | 54.65%
Expected life (years) |  |  | 4.5 |  |  |  | 4.5 |
Expected dividend yield |  |  | 0.00% |  |  |  | 0.00% |

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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + 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) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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