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Shareholders' Equity (Information About Nonvested Options) (Details) - $ / shares | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Options |  |  |
Beginning balance | 683,347 |  |
Granted |  | 154,600 | 527,500
Vested | (348,962) |  |
Forfeited | (32,576) |  |
Ending balance | 301,809 | 683,347 |
Weighted average grant- date fair value |  |  |
Beginning balance | $ 1.58 |  |
Granted |  |  |
Vested | 1.32 |  |
Forfeited | 1.45 |  |
Ending balance | $ 2.04 | $ 1.58 |

X
- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + 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 (d)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of non-vested options outstanding. + References No definition available. + Details
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X
- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Number of non-vested options forfeited. + References No definition available. + Details
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X
- Definition Weighted average grant-date fair value of non-vested options forfeited. + References No definition available. + Details
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X
- Definition Weighted average grant-date fair value of non-vested options outstanding. + References No definition available. + Details
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- References No definition available. + Details
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- Definition Number of options vested. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
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Period Type: | duration

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- Definition Weighted average grant-date fair value of options vested. + References No definition available. + Details
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