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Note 13 - Equity Incentive Plan - Stock Options and SAR's Activity (Details)
 12 Months Ended
Dec. 31, 2019
$ / shares
shares
Options and SARs outstanding (in shares) | shares 1,136,914
Options and SAR's outstanding, Weighted Average Exercise Price Per Share (in dollars per share) | $ / shares $ 42.06
Options and SAR's Granted (in shares) | shares 254,517
Options and SAR's Granted, Weighted Average Exercise Price Per Share (in dollars per share) | $ / shares $ 41.92
Options and SAR's Cancelled (in shares) | shares (97,575)
Options and SAR's Cancelled, Weighted Average Exercise Price Per Share (in dollars per share) | $ / shares $ 48.40
Options and SAR's Expired (in shares) | shares (48,647)
Options and SAR's Expired, Weighted Average Exercise Price Per Share (in dollars per share) | $ / shares $ 51.18
Options and SAR's Exercised (in shares) | shares (554,241)
Options and SAR's Exercised, Weighted Average Exercise Price Per Share (in dollars per share) | $ / shares $ 40.37
Options and SARs outstanding (in shares) | shares 690,968
Options and SAR's outstanding, Weighted Average Exercise Price Per Share (in dollars per share) | $ / shares $ 41.65