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Share-Based Compensation (Narrative) (Details) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2018 USD ($) $ / shares shares | Jun. 30, 2017 USD ($) $ / shares | Jun. 30, 2018 USD ($) shares | Jun. 30, 2017 USD ($) | May 04, 2018 shares | May 07, 2015 shares | May 31, 2012 shares | May 31, 2005 shares
Nonemployee director annual stock grants | shares |  |  | 25,000 |  |  |  |  |
Stock or Unit Option Plan Expense | $ | $ 368 | $ 342 | $ 1,794 | $ 1,865 |  |  |  |
Unrecognized compensation cost | $ | $ 1,339 |  | $ 1,339 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value | $ / shares | $ 4.49 | $ 5.75 |  |  |  |  |  |
2012 Plan [Member] |  |  |  |  |  |  |  |
Shares available for grants | shares | 891,668 |  | 891,668 |  | 3,500,000 | 3,000,000 | 1,500,000 |
Stock Option Plan, Award Vesting Period |  |  | 5 years |  |  |  |  |
Common stock on date granted term period, years |  |  | 10 |  |  |  |  |
Prior To Shareholder Approval of Increase [Member] |  |  |  |  |  |  |  |
Nonemployee director annual stock grants | shares |  |  | 15,000 |  |  |  |  |
Prior To Shareholder Approval of Second Amendment [Member] |  |  |  |  |  |  |  |
Nonemployee director annual stock grants | shares |  |  | 20,000 |  |  |  |  |
2005 Plan [Member] |  |  |  |  |  |  |  |
Shares available for grants | shares |  |  |  |  |  |  |  | 1,500,000
Stock Option Plan, Award Vesting Period | 10 years |  |  |  |  |  |  |
Common stock on date granted term period, years | 10 |  |  |  |  |  |  |
Expected To Be Recognized During 2018 [Member] |  |  |  |  |  |  |  |
Unrecognized compensation cost | $ | $ 737 |  | $ 737 |  |  |  |  |
Expected To Be Recognized During 2019 [Member] |  |  |  |  |  |  |  |
Unrecognized compensation cost | $ | 542 |  | 542 |  |  |  |  |
Expected To Be Recognized During 2020 [Member] |  |  |  |  |  |  |  |
Unrecognized compensation cost | $ | $ 60 |  | $ 60 |  |  |  |  |

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- Definition Unrecognized cost of unvested share-based compensation awards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The noncash expense that accounts for the value of stock or unit options distributed to employees as compensation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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