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Note 2 - Stock-based Compensation (Tables) | 3 Months Ended
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Mar. 31, 2019
Notes Tables |
Share-based Payment Arrangement, Activity [Table Text Block] |
|  | Awards Available |  | Options Outstanding |  | Weighted Average Exercise Price
Balance December 31, 2018 |  |  | 805 |  |  |  | 17,491 |  |  | $ | 6.49 |
Restricted stock unit awards granted |  |  | — |  |  |  | — |  |  |  | — |
Restricted stock unit awards cancelled |  |  | — |  |  |  | — |  |  |  | — |
Stock option awards granted |  |  | (437 | ) |  |  | 437 |  |  |  | 8.91 |
Stock option awards exercised |  |  | — |  |  |  | (155 | ) |  |  | 3.42 |
Stock option awards cancelled |  |  | 78 |  |  |  | (78 | ) |  |  | 6.35 |
Balance March 31, 2019 |  |  | 446 |  |  |  | 17,695 |  |  | $ | 6.58 |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
|  | 2019 |  | 2018
Expected Life in Years |  |  | 5.5 |  |  |  | 5.5 |
Expected Volatility |  |  | 81.0 | % |  |  | 82.0 | %
Expected Dividend Yield |  |  | 0.0 | % |  |  | 0.0 | %
Risk-Free Interest Rate |  |  | 2.5 | % |  |  | 2.4 | %

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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