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Note 2 - Stock-based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2016
Notes Tables |
Schedule of Share-based Compensation, Activity [Table Text Block] |
|  | Awards Available |  | Options Outstanding |  | Weighted Average Exercise Price
Balance December 31, 2015 |  |  | 16 |  |  |  | 10,671 |  |  | $ | 7.50 |
Plan amendment |  |  | 3,800 |  |  |  | — |  |  |  | — |
Restricted stock unit awards granted |  |  | (21 | ) |  |  | — |  |  |  | — |
Restricted stock unit awards cancelled |  |  | 15 |  |  |  | — |  |  |  | — |
Stock option awards granted |  |  | (2,120 | ) |  |  | 2,120 |  |  |  | 3.21 |
Stock option awards exercised |  |  | — |  |  |  | (79 | ) |  |  | 2.32 |
Stock option awards cancelled |  |  | 499 |  |  |  | (499 | ) |  |  | 11.24 |
Balance June 30, 2016 |  |  | 2,189 |  |  |  | 12,213 |  |  | $ | 6.63 |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
|  | 2016 |  | 2015
Expected Life in Years |  |  | 5.6 |  |  |  | 5.5 |
Expected Volatility |  |  | 82 | % |  |  | 83 | %
Expected Dividend Yield |  |  | 0.0 | % |  |  | 0.0 | %
Risk-Free Interest Rate |  |  | 1.4 | % |  |  | 1.5 | %

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- Definition Tabular disclosure of share-based compensation plans that may be presented in a single table for outstanding, vested and expected to vest, and exercisable awards. The information that may be disclosed in this table may include, but is not limited to, number of shares, weighted average exercise price, weighted average remaining contractual life, and aggregate intrinsic value. + References No definition available. + Details
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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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