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Note 12 - Equity Incentive Plan - Stock Options and SAR's Activity (Details) | 12 Months Ended
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Dec. 31, 2017 $ / shares | Dec. 31, 2016 $ / shares
Options and SAR's outstanding at beginning of year | 979,569 | 762,260
Options and SAR's outstanding at beginning of year, Weighted Average Exercise Price Per Share (in dollars per share) | $ 26.15 | $ 18.75
Options and SAR's Granted | 440,688 | 354,275
Options and SAR's Granted, Weighted Average Exercise Price Per Share (in dollars per share) | $ 50.22 | $ 40.77
Options and SAR's Cancelled | (74,527) | (58,841)
Options and SAR's Cancelled, Weighted Average Exercise Price Per Share (in dollars per share) | $ 45.56 | $ 30.05
Options and SAR's Expired | (589) | (3,310)
Options and SAR's Expired, Weighted Average Exercise Price Per Share (in dollars per share) | $ 32.86 | $ 11.37
Options and SAR's Exercised | (17,941) | (74,815)
Options and SAR's Exercised, Weighted Average Exercise Price Per Share (in dollars per share) | $ 20.56 | $ 15.46
Options and SAR's outstanding at end of year | 1,327,200 | 979,569
Options and SAR's outstanding at end of year, Weighted Average Exercise Price Per Share (in dollars per share) | $ 33.70 | $ 26.15

X
- Definition Represents share-based compensation arrangement by share-based payment award options and stock appreciation rights weighted average exercise price. + References No definition available. + Details
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X
- Definition Number of share options and stock appreciation rights exercised during the current period. + References No definition available. + Details
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- Definition Weighted average price at which option and stock appreciation rights holders acquired shares when converting their stock options and stock appreciation rights into shares. + References No definition available. + Details
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- Definition Number of options and stock appreciation rights or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements. + 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 and stock appreciation rights of the plan that expired. + References No definition available. + Details
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- Definition The number of shares under options and stock appreciation rights that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the plan. + 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 and stock appreciation rights that were terminated. + References No definition available. + Details
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- Definition Net number of share options and stock appreciation rights granted during the period. + References No definition available. + Details
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- Definition Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options and stock appreciation rights. + References No definition available. + Details
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- Definition Number of share-based compensation arrangement by share-based payment award options and stock appreciation rights outstanding. + References No definition available. + Details
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