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Note 9 - Capital Stock and Stock-based Compensation - Stock Option and Restricted Stock Unit Activity (Details) - $ / shares | 6 Months Ended
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Jun. 30, 2020 | Jun. 30, 2019
Options, outstanding (in shares) | 2,266,122 |
Options, outstanding, weighted average exercise price (in dollars per share) | $ 3.93 |
Options, granted (in shares) | 894,154 |
Options, granted, weighted average exercise price (in dollars per share) | $ 2.61 |
Options, exercised (in shares) | (7,359) |
Options, exercised, weighted average exercise price (in dollars per share) | $ 2.56 |
Options, expired (in shares) | (15,819) |
Options, expired, weighted average exercise price (in dollars per share) | $ 2.59 |
Options, cancelled / forfeited (in shares) | (233,080) |
Options, cancelled / forfeited, weighted average exercise price (in dollars per share) | $ 3.55 |
Options, outstanding (in shares) | 2,904,018 |
Options, outstanding, weighted average exercise price (in dollars per share) | $ 3.56 |
Restricted Stock Units (RSUs) [Member] |  |
Restricted stock units, outstanding (in shares) | 1,590,450 |
Restricted stock units, outstanding, grant date fair value (in dollars per share) | $ 2.27 |
Restricted stock units, granted (in shares) | 994,513 |
Restricted stock units, granted, grant date fair value (in dollars per share) | $ 2.73 |
Restricted stock units, vested (in shares) | (513,779) |
Restricted stock units, vested, grant date fair value (in dollars per share) | $ 2.59 |
Restricted stock units, cancelled / forfeited (in shares) | (70,313) |
Restricted stock units, cancelled / forfeited, grant date fair value (in dollars per share) | $ 3.24 |
Restricted stock units, outstanding (in shares) | 2,000,871 |
Restricted stock units, outstanding, grant date fair value (in dollars per share) | $ 2.38 |
Market Condition Restricted Stock Units [Member] |  |
Restricted stock units, outstanding (in shares) | 529,491 |
Restricted stock units, outstanding, grant date fair value (in dollars per share) | $ 1.67 |
Restricted stock units, granted (in shares) | 332,622 |
Restricted stock units, granted, grant date fair value (in dollars per share) | $ 2.98 | $ 4.16
Restricted stock units, vested (in shares) | 0 |
Restricted stock units, vested, grant date fair value (in dollars per share) | $ 0 |
Restricted stock units, cancelled / forfeited (in shares) | (39,286) |
Restricted stock units, cancelled / forfeited, grant date fair value (in dollars per share) | $ 3.03 |
Restricted stock units, outstanding (in shares) | 822,827 |
Restricted stock units, outstanding, grant date fair value (in dollars per share) | $ 2.13 |

X
- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + 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)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event. + 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)(3) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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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 weighted average fair value at grant date for nonvested equity-based awards issued 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 number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + 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)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options. + 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)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + 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)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement. + 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)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements. + 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)(1)(iv)(4) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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