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Note 2 - Summary of significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2016
Notes Tables |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
|  | 201 6 |  |  | 2015 |
Weighted average grant date fair value |  | $ | 0.28 |  |  | $ | 1.94 |
Weighted average assumptions used: |  |  |  |  |  |  |  |
Expected dividend yield |  |  | 0.00 | % |  |  | 0.00 | %
Risk-free interest rate |  |  | 1.64 | % |  |  | 1.51 | %
Expected volatility |  |  | 110.24 | % |  |  | 229.24 | %
Expected life (in years) |  |  | 5.00 |  |  |  | 5.00 |

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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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