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Note 11 - Share-based Compensation - Stock Option Transactions (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Outstanding, options (in shares)	970,022
Outstanding, weighted average exercise price (in dollars per share)	$ 12.92
Outstanding, weighted average remaining life (Year)	3 years 3 months 7 days	3 years 8 months 26 days
Outstanding, aggregate intrinsic value	$ 5,097	$ 11,128
Granted (in shares)	143,712
Granted, weighted average exercise price (in dollars per share)	$ 25.00
Exercised (in shares)	(305,018)
Exercised, weighted average exercise price (in dollars per share)	$ 10.27
Lapsed or cancelled (in shares)	(28,778)
Lapsed or cancelled, weighted average exercise price (in dollars per share)	$ 14.74
Outstanding, options (in shares)	779,938	970,022
Outstanding, weighted average exercise price (in dollars per share)	$ 16.12	$ 12.92
Exercisable, options (in shares)	438,705
Exercisable, weighted average exercise price, options (in dollars per share)	$ 15.03
Exercisable, weighted average remaining life, options (Year)	2 years 8 months 4 days
Exercisable, aggregate intrinsic value, options	$ 3,153

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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Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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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 of the plan that expired.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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

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