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Note 2 - Stock-based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2020
Notes Tables |
Share-based Payment Arrangement, Activity [Table Text Block] |
|  |  |  |  |  |  |  |  |  | Weighted |
|  |  |  |  |  |  |  |  |  | Average |
|  | Awards |  |  | Options |  |  | Exercise |
|  | Available |  |  | Outstanding |  |  | Price |
Balance December 31, 2019 |  |  | 968 |  |  |  | 21,050 |  |  | $ | 5.96 |
Plan amendment |  |  | 8,000 |  |  |  | - |  |  |  | - |
Restricted stock unit awards granted |  |  | (22 | ) |  |  | - |  |  |  | - |
Restricted stock unit awards cancelled |  |  | - |  |  |  | - |  |  |  | - |
Stock option awards granted |  |  | (547 | ) |  |  | 547 |  |  |  | 4.87 |
Stock option awards exercised |  |  | - |  |  |  | (193 | ) |  |  | 2.76 |
Stock option awards cancelled |  |  | 2,495 |  |  |  | (2,495 | ) |  |  | 6.66 |
Balance June 30, 2020 |  |  | 10,894 |  |  |  | 18,909 |  |  | $ | 5.85 |
|  |  |  |  |  |  |  |  |  | Weighted |
|  |  |  |  |  |  |  |  |  | Average |
|  | Awards |  |  | Options |  |  | Exercise |
|  | Available |  |  | Outstanding |  |  | Price |
Balance December 31, 2019 |  |  | 171 |  |  |  | 1,329 |  |  | $ | 3.60 |
Plan amendment |  |  | 1,700 |  |  |  | - |  |  |  | - |
Stock option awards granted |  |  | (1,502 | ) |  |  | 1,502 |  |  |  | 3.34 |
Stock option awards exercised |  |  | - |  |  |  | - |  |  |  | - |
Stock option awards cancelled |  |  | 145 |  |  |  | (145 | ) |  |  | 4.28 |
Balance June 30, 2020 |  |  | 514 |  |  |  | 2,686 |  |  | $ | 3.42 |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
|  | 2020 |  |  | 2019 |
Expected Life in Years |  |  | 5.5 |  |  |  | 5.5 |
Expected Volatility |  |  | 83.7 | % |  |  | 81.0 | %
Expected Dividend Yield |  |  | 0.0 | % |  |  | 0.0 | %
Risk-Free Interest Rate |  |  | 0.5 | % |  |  | 2.3 | %

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- Definition Tabular disclosure of activity for award under share-based payment arrangement. Includes, but is not limited to, outstanding award at beginning and end of year, granted, exercised, forfeited, and weighted-average grant date fair value. + 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 (e) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120381028&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://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=120381028&loc=d3e5070-113901 + Details
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