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Note 9 - Stockholders' Equity - Summary of Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Outstanding, Number of shares (in shares) | [1] | 702,817 |  |  |
Outstanding, Weighted average exercise price (in dollars per share) |  | $ 19.88 |  |  |
Outstanding, Weighted average remaining contractual term (Year) |  | 3 years 182 days | [2] | 4 years 109 days |
Outstanding, Aggregate intrinsic value |  | $ 4,718 | [2] | $ 2,708 |
Granted, Number of shares (in shares) |  | 0 |  | 0 | 0
Exercised, Number of shares (in shares) | [1] | (54,834) |  |  |
Exercised, Weighted average exercise price (in dollars per share) |  | $ 16.71 |  |  |
Forfeited or expired, Number of shares (in shares) | [1] | (5,730) |  |  |
Forfeited or expired, Weighted average exercise price (in dollars per share) |  | $ 20.08 |  |  |
Outstanding, Number of shares (in shares) | [1] | 642,253 | [2] | 702,817 |
Outstanding, Weighted average exercise price (in dollars per share) |  | $ 20.14 | [2] | $ 19.88 |
Exercisable, Number of shares (in shares) | [1],[3] | 616,253 |  |  |
Exercisable, Weighted average exercise price (in dollars per share) | [3] | $ 19.80 |  |  |
Exercisable, Weighted average remaining contractual term (Year) | [3] | 3 years 146 days |  |  |
Exercisable, Aggregate intrinsic value | [3] | $ 4,718 |  |  |
[1] | The SAR units are convertible for a maximum number of shares of the Company's common stock equal to 75% of the SAR units subject to the grant.
[2] | Due to the ceiling imposed on the SAR grants, the outstanding amount equals a maximum of 596,877 shares of the Company's common stock issuable upon exercise.
[3] | Due to the ceiling imposed on the SAR grants, the exercisable amount equals a maximum of 570,877 shares of the Company's common stock issuable upon exercise.

X
- Definition Weighted average grant-date fair value of options and SARs exercisable. + References No definition available. + Details
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X
- Definition Gross number of share options and SARs granted during the period. + References No definition available. + Details
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- Definition Number of options and stock appreciation rights outstanding. + References No definition available. + Details
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- Definition Intrinsic value of options and SARs exercisable. + References No definition available. + Details
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- Definition Intrinsic value of options and SARs outstanding. + References No definition available. + Details
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- Definition Weighted average remaining contractual terms of options and SARs exercisable. + References No definition available. + Details
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- Definition Number of share options and SARs exercisable. + References No definition available. + Details
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- Definition Number of share options and SARs exercised during the current period. + References No definition available. + Details
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- Definition Weighted average grant-date fair value of options and SARs exercised during period. + References No definition available. + Details
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X
- Definition Number of share options and SARs forfeited or expired during the current period. + References No definition available. + Details
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X
- Definition Represents the weighted average remaining contractual term of options and SARs outstanding. + References No definition available. + Details
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