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Note 13 - Stock-based Compensation - Stock Option Activity (Details) - $ / shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Options outstanding (in shares)	399,055	569,639	766,042
Options outstanding, weighted- average exercise price (in dollars per share)	$ 51.13	$ 45	$ 36.52
Granted (in shares)	36,600	60,100	117,480
Granted, weighted- average exercise price (in dollars per share)	$ 110.59	$ 69.06	$ 57.99
Exercised (in shares)	(155,765)	(187,313)	(226,164)
Exercised, weighted- average exercise price (in dollars per share)	$ 38.92	$ 35.93	$ 16.65
Cancelled (in shares)	(27,274)	(43,371)	(87,719)
Cancelled, weighted- average exercise price (in dollars per share)	$ 74.35	$ 61.02	$ 61.41
Options outstanding (in shares)	252,616	399,055	569,639
Options outstanding, weighted- average exercise price (in dollars per share)	$ 64.71	$ 51.13	$ 45
Options exercisable (in shares)	125,925
Options exercisable, weighted- average exercise price (in dollars per share)	$ 53.02

X

- Definition

The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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Gross number of share options (or share units) granted during the period.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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