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Note 2 - Stock-based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2017
Notes Tables |
Share-based Compensation, Activity [Table Text Block] |
|  | Awards Available |  | Options Outstanding |  | Weighted Average Exercise Price
Balance December 31, 2016 |  |  | 2,273 |  |  |  | 12,095 |  |  | $ | 6.55 |
Plan amendment |  |  | 1,000 |  |  |  | — |  |  |  | — |
Restricted stock unit awards granted |  |  | (11 | ) |  |  | — |  |  |  | — |
Restricted stock unit awards cancelled |  |  | 2 |  |  |  | — |  |  |  | — |
Stock option awards granted |  |  | (2,563 | ) |  |  | 2,563 |  |  |  | 5.49 |
Stock option awards exercised |  |  | — |  |  |  | (368 | ) |  |  | 3.37 |
Stock option awards cancelled |  |  | 877 |  |  |  | (877 | ) |  |  | 10.30 |
Balance June 30, 2017 |  |  | 1,578 |  |  |  | 13,413 |  |  | $ | 6.19 |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
|  | 2017 |  | 2016
Expected Life in Years |  |  | 5.5 |  |  |  | 5.6 |
Expected Volatility |  |  | 82.0 | % |  |  | 82.0 | %
Expected Dividend Yield |  |  | 0.0 | % |  |  | 0.0 | %
Risk-Free Interest Rate |  |  | 1.9 | % |  |  | 1.4 | %

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- Definition Tabular disclosure for share-based compensation plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + 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 (c)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + 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=96867065&loc=d3e5070-113901 + Details
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