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Note 13 - Common Shares - Share Repurchases (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Stock Repurchased and Retired During Period, Shares (in shares)	70,238	101,816	0
Stock Repurchased and Retired During Period, Value	$ 3,281	$ 4,986	$ 0
Average price per share (in dollars per share)	$ 46.70	$ 48.97	$ 0
Number of shares (in shares)	48,013	21,332	19,777
Aggregate market value of shares (in thousands)	$ 2,957	$ 1,510	$ 1,138
Average price per share (in dollars per share)	$ 61.58	$ 70.77	$ 57.56

X

- Definition

The aggregate market value of shares that received in connection with share-based compensation.

+ References

No definition available.

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- Definition

Per share price of shares that received in connection with share-based compensation.

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- Definition

Per share or per unit amount of shares that have been repurchased and retired during the period.

+ References

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- Definition

Number of shares used to settle grantee's tax withholding obligation for award under share-based payment arrangement.

+ References

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- Definition

Number of shares that have been repurchased and retired during the period.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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- Definition

Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital).

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