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Shareholders' Equity (Stock Options) (Narrative) (Details) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	May 31, 2009	Dec. 31, 2020	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options, percent vested on one year anniversary of grant	25.00%
Options, monthly vesting percentage beginning after year one anniversary	2.083%
Options, number of months vesting after one year anniversary	36
Total intrinsic value of options exercised		$ 28	$ 256
Total intrinsic value of outstanding options		$ 323
Stock Option Plans:
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options, merit vesting period	3 years
Stock Option Plans: | Minimum | 2006 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Plan modification, contractual life	6 years

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Share-based compensation arrangement by share-based payment award, options, monthly vesting percent vesting beginning after year one

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Share-based compensation arrangement by share-based payment award, options, percent vested on one year anniversary of grant

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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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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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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