Note 15 - Stock-based Compensation - Information of Stock Options Granted, Exercised and Vested (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020
Weighted average fair value per share of options granted (in dollars per share)	$ 24.00	$ 9.47
Proceeds from exercise of stock options	$ 1,885	$ 1,326
Aggregate intrinsic value of options exercised	13,673	5,726
Grant date fair value of shares vested	$ 834	$ 944

Amount of cash inflow from exercise of option under share-based payment arrangement.

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-Name Accounting Standards Codification
-Topic 718
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
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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.

+ References

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-Publisher FASB
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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock.

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