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Shareholders' Equity (Employee Stock Purchase Plans) (Narrative) (Details) - 2010 Employee Stock Purchase Plan [Member] - USD ($) $ in Thousands |  | 12 Months Ended
--- | --- | ---
May 18, 2010 | Dec. 31, 2020 | Dec. 31, 2019
Employee Stock Purchase Plan, Activity in Period [Line Items] |  |  |
Employee Stock Purchase Plan, offering period | 18 months |  |
Employee Stock Purchase Plan, purchase period | 6 months |  |
Employee Stock Purchase Plan, maximum number of shares per employee | 3,000 |  |
Employee Stock Purchase Plan, maximum annual purchase amount per employee | $ 25 |  |
Employee Stock Purchase Plan, purchase price of common stock, percent | 85.00% |  |
Employee Stock Purchase Plan, number of shares authorized | 3,300,000 |  |
Employee Stock Purchase Plans, shares issued |  | 202,019 | 194,361
Employee Stock Purchase Plans, proceeds from shares issued |  | $ 529 | $ 519

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- Definition The highest quantity of shares an employee can purchase under the plan per period. + 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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- Definition Number of shares issued during the period as a result of an employee stock purchase plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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