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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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- Definition 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 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + 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 -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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