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Note 7 - Stock-based Compensation - Stock Plan Activities (Details) - $ / shares shares in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2021
Options outstanding, stock option awards exercised (in shares) | (942) |
Incentive Plan [Member] |  |
Awards available, beginning balance (in shares) |  | 4,592
Options outstanding, beginning balance (in shares) |  | 24,885
Weighted average exercise price, beginning balance (in dollars per share) |  | $ 6.52
Plan amendment (in shares) |  | 7,500
Awards available, Restricted stock awards granted (in shares) |  | (100)
Awards available, stock option awards granted (in shares) |  | (2,108)
Options outstanding, stock option awards granted (in shares) |  | 2,108
Weighted average exercise price, stock option awards granted (in dollars per share) |  | $ 11.87
Options outstanding, stock option awards exercised (in shares) |  | (2,205)
Weighted average exercise price, stock option awards exercised (in dollars per share) |  | $ 4.11
Awards available, stock option awards cancelled (in shares) |  | 208
Options outstanding, stock option awards cancelled (in shares) |  | (208)
Weighted average exercise price, stock option awards cancelled (in dollars per share) |  | $ 7.47
Awards available, ending balance (in shares) | 10,092 | 10,092
Options outstanding, ending balance (in shares) | 24,580 | 24,580
Weighted average exercise price, ending balance (in dollars per share) | $ 7.18 | $ 7.18
Inducement Plan [Member] |  |
Awards available, beginning balance (in shares) |  | 229
Options outstanding, beginning balance (in shares) |  | 4,171
Weighted average exercise price, beginning balance (in dollars per share) |  | $ 3.88
Plan amendment (in shares) |  | 1,500
Awards available, stock option awards granted (in shares) |  | (738)
Options outstanding, stock option awards granted (in shares) |  | 738
Weighted average exercise price, stock option awards granted (in dollars per share) |  | $ 14.23
Options outstanding, stock option awards exercised (in shares) |  | (386)
Weighted average exercise price, stock option awards exercised (in dollars per share) |  | $ 3.61
Awards available, stock option awards cancelled (in shares) |  | 122
Options outstanding, stock option awards cancelled (in shares) |  | (122)
Weighted average exercise price, stock option awards cancelled (in dollars per share) |  | $ 3.86
Awards available, ending balance (in shares) | 1,113 | 1,113
Options outstanding, ending balance (in shares) | 4,401 | 4,401
Weighted average exercise price, ending balance (in dollars per share) | $ 5.64 | $ 5.64

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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + 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 (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + 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 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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