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Note 10 - Common Stock and Stock-based Compensation Plans - Summary of Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2020 | Dec. 31, 2019
Outstanding, Number of shares (in shares) | [1] | 642,253 |  |
Outstanding, Weighted average exercise price (in dollars per share) |  | $ 20.14 |  |
Outstanding, Weighted average remaining contractual term (Year) |  | 3 years 4 months 24 days | [2] | 3 years 6 months
Outstanding, Aggregated intrinsic value |  | $ 7,061 | [2] | $ 4,718
Granted, Number of shares (in shares) | [1] | 0 |  |
Exercised, Number of shares (in shares) | [1] | (201,066) |  |
Exercised, Weighted average exercise price (in dollars per share) |  | $ 17.36 |  |
Forfeited or expired, Number of shares (in shares) | [1] | (21) |  |
Forfeited or expired, Weighted average exercise price (in dollars per share) |  | $ 16.20 |  |
Outstanding, Number of shares (in shares) | [1] | 441,166 | [2] | 642,253
Outstanding, Weighted average exercise price (in dollars per share) |  | $ 21.42 | [2] | $ 20.14
Exercisable, Number of shares (in shares) | [1],[3] | 415,166 |  |
Exercisable, Weighted average exercise price (in dollars per share) | [3] | $ 20.98 |  |
Exercisable, Weighted average remaining contractual term (Year) | [3] | 3 years 3 months 18 days |  |
Exercisable, Aggregated intrinsic value | [3] | $ 6,827 |  |
[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 422,500 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 396,500 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 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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- Definition Number of share options and SARs forfeited or expired during the current period. + References No definition available. + Details
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