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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 | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 | Dec. 31, 2018
Outstanding, Number of shares (in shares) | [1] | 702,817 |  |
Outstanding, Weighted average exercise price (in dollars per share) |  | $ 19.95 | [2] | $ 19.88
Outstanding, Weighted average remaining contractual term (Year) |  | 4 years 36 days | [2] | 4 years 109 days
Outstanding, Aggregated intrinsic value |  | $ 5,142 | [2] | $ 2,708
Granted, Number of shares (in shares) | [1] |  |  |
Exercised, Number of shares (in shares) | [1] | (17,963) |  |
Exercised, Weighted average exercise price (in dollars per share) |  | $ 17.09 |  |
Forfeited or expired, Number of shares (in shares) | [1] | (375) |  |
Forfeited or expired, Weighted average exercise price (in dollars per share) |  | $ 24.86 |  |
Outstanding, Number of shares (in shares) | [1] | 684,479 | [2] | 702,817
Exercisable, Number of shares (in shares) | [1],[3] | 610,513 |  |
Exercisable, Weighted average exercise price (in dollars per share) | [3] | $ 19.22 |  |
Exercisable, Weighted average remaining contractual term (Year) | [3] | 3 years 292 days |  |
Exercisable, Aggregated intrinsic value | [3] | $ 4,993 |  |
[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 628,547 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 555,947 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 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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