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Note 8 - Stock Based Compensation - Summary of Stock Options (Details) | 12 Months Ended
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Dec. 31, 2021 $ / shares shares | Dec. 31, 2020 $ / shares shares
Outstanding, shares (in shares) | 17,082 | 29,165
Outstanding, Weighted average exercise price per shar (in dollars per share) | $ / shares | $ 6.10 | $ 7.20
Outstanding, Weighted average grant date fair value | 3.36 | 3.76
Forfeited, shares (in shares) |  | (12,083)
Forfeited, Weighted average exercise price per share (in dollars per share) | $ / shares |  | $ 8.76
Forfeited, Weighted average grant date fair value |  | 4.34
Exercised, shares (in shares) | (4,166) |
Exercised, Weighted average exercise price per share | 8.04 |
Exercised, Weighted average grant date fair value | 4.34 |
Outstanding, shares (in shares) | 12,916 | 17,082
Outstanding, Weighted average exercise price per shar (in dollars per share) | $ / shares | $ 5.47 | $ 6.10
Outstanding, Weighted average grant date fair value | 2.98 | 3.36

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- Definition Weighted average grant-date fair value of options outstanding. + References No definition available. + Details
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- Definition Gross number of share options (or share units) exercised during the period. + References No definition available. + Details
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- Definition Weighted average grant-date fair value of options exercised. + References No definition available. + Details
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- Definition Weighted average grant-date fair value of options forfeited. + References No definition available. + 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 exercised. + References No definition available. + Details
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- Definition 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. + 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 Number of options outstanding, including both vested and non-vested 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 -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)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=120381028&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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