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Note 7 - Share-based Compensation - Stock Option Transactions (Details) $ / shares in Units, $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2022 USD ($) $ / shares shares | Dec. 31, 2021 USD ($) $ / shares shares
Outstanding, options (in shares) | shares | 779,938 |  |
Outstanding, weighted average exercise price (in dollars per share) | $ / shares | $ 16.12 |  |
Outstanding, weighted average remaining life (Year) | 3 years 1 month 17 days |  | 3 years 3 months 7 days
Outstanding, aggregate intrinsic value | $ | $ 2,608 |  | $ 5,097
Granted (in shares) | shares | 103,203 | [1] |
Granted, weighted average exercise price (in dollars per share) | $ / shares | $ 20.13 |  |
Exercised (in shares) | shares | (53,417) |  |
Exercised, weighted average exercise price (in dollars per share) | $ / shares | $ 11.95 |  |
Lapsed or cancelled (in shares) | shares | (7,572) |  |
Lapsed or cancelled, weighted average exercise price (in dollars per share) | $ / shares | $ 17.89 |  |
Outstanding, options (in shares) | shares | 822,152 |  | 779,938
Outstanding, weighted average exercise price (in dollars per share) | $ / shares | $ 16.88 |  | $ 16.12
Exercisable, options (in shares) | shares | 550,456 |  |
Exercisable, weighted average exercise price, options (in dollars per share) | $ / shares | $ 13.96 |  |
Exercisable, weighted average remaining life, options (Year) | 2 years 6 months 29 days |  |
Exercisable, aggregate intrinsic value, options | $ | $ 2,608 |  |
[1] | The weighted average grant date fair value of stock options granted was $7.84 per share.

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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI https://asc.fasb.org/extlink&oid=128089324&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://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(04) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition Gross number of share options (or share units) granted during the period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(01) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + 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 https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(ii) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees could have acquired the underlying shares with respect to stock options of the plan that expired. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(04) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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