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Note 10 - Capital Stock and Stock-based Compensation - Stock Option and Restricted Stock Unit Activity (Details) - $ / shares | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Opening Balance, Stock Options Outstanding (in shares) | 2,266,122 | 1,956,732
Options, Outstanding, Weighted Average Exercise Price (in dollars per share) | $ 3.93 | $ 4.25
Options, Granted in Period (in shares) | 894,154 | 943,424
Options, Granted in Period, Weighted Average Exercise Price (in dollars per share) | $ 2.61 | $ 3.28
Options, exercised (in shares) | (253,853) | (3,750)
Options, exercised, weighted average exercise price (in dollars per share) | $ 3.94 | $ 2.98
Options, Cancelled / Forfeited in Period (in shares) | (269,084) | (630,284)
Options, Cancelled / Forfeited, Weighted Average Exercise Price (in dollars per share) | $ 3.68 | $ 3.96
Opening Balance, Stock Options Outstanding (in shares) | 2,637,339 | 2,266,122
Options, Outstanding, Weighted Average Exercise Price (in dollars per share) | $ 3.51 | $ 3.93
Restricted Stock Units (RSUs) [Member] |  |
Restricted Stock Units Outstanding , Balance (in shares) | 1,590,450 | 1,233,762
Restricted Stock Units Outstanding , Grant Date Fair Value, Balance (in dollars per share) | $ 2.27 | $ 3.36
Restricted Stock Units, Granted in Period (in shares) | 1,027,486 | 1,652,720
Restricted Stock Units Granted , Grant Date Fair Value, Balance (in dollars per share) | $ 2.75 | $ 2.31
Restricted Stock Units, Vested in Period (in shares) | (930,985) | (813,762)
Restricted Stock Units, Vested , Grant Date Fair Value, Balance (in dollars per share) | $ 2.41 | $ 3.29
Restricted Stock Units, Cancelled / Forfeited in Period (in shares) | (126,490) | (482,270)
Restricted Stock Units, Cancelled/ Forfeited , Grant Date Fair Value, Balance (in dollars per share) | $ 3.13 | $ 3.42
Market Condition RSU - factor adjustment (in shares) | 0 |
Market Condition RSU - factor adjustment (in dollars per share) | $ 0 |
Restricted Stock Units Outstanding , Balance (in shares) | 1,560,461 | 1,590,450
Restricted Stock Units Outstanding , Grant Date Fair Value, Balance (in dollars per share) | $ 2.44 | $ 2.27
Market Condition Restricted Stock Units [Member] |  |
Restricted Stock Units Outstanding , Balance (in shares) | 529,491 | 116,944
Restricted Stock Units Outstanding , Grant Date Fair Value, Balance (in dollars per share) | $ 1.67 | $ 4.19
Restricted Stock Units, Granted in Period (in shares) | 332,622 | 605,005
Restricted Stock Units Granted , Grant Date Fair Value, Balance (in dollars per share) | $ 2.98 | $ 1.98
Restricted Stock Units, Vested in Period (in shares) | (240,205) | (3,778)
Restricted Stock Units, Vested , Grant Date Fair Value, Balance (in dollars per share) | $ 1.53 | $ 4.19
Restricted Stock Units, Cancelled / Forfeited in Period (in shares) | (41,932) | (188,680)
Restricted Stock Units, Cancelled/ Forfeited , Grant Date Fair Value, Balance (in dollars per share) | $ 3.04 | $ 4.18
Market Condition RSU - factor adjustment (in shares) | 233,055 |
Market Condition RSU - factor adjustment (in dollars per share) | $ 1.47 |
Restricted Stock Units Outstanding , Balance (in shares) | 813,031 | 529,491
Restricted Stock Units Outstanding , Grant Date Fair Value, Balance (in dollars per share) | $ 2.12 | $ 1.67

X
- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were adjusted for performance factors during the reporting period. + References No definition available. + Details
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- 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 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 For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired. + 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)-(4) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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