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Note 15 - Stock-based Compensation - Options Exercised (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Number of options exercised (in shares)	294,238
Aggregate fair value	$ 11,510	$ 11,057
Share-based Payment Arrangement, Option [Member]
Number of options exercised (in shares)	294,238
Aggregate fair value	$ 33,734
Intrinsic value	22,224
Amount of cash received	$ 11,510

X

- Definition

Amount of cash inflow from issuance of shares under share-based payment arrangement. Includes, but is not limited to, option exercised.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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Number of share options (or share units) exercised during the current period.

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