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Common Stock Options (Schedule Of Stock Options Activity) (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Granted, Number of Shares |  | 0 |  |
Exercised, Number of Shares |  | 0 | 0 |
Employee Stock Option [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Beginning balance, Number of Shares |  | 100,000 | 50,000 |
Granted, Number of Shares |  | 0 | 50,000 |
Exercised, Number of Shares |  | 0 | 0 |
Canceled/forfeited/expired, Number of Shares |  | 0 | 0 |
Ending balance, Number of Shares |  | 100,000 | 100,000 | 50,000
Beginning balance, Weighted-Average Exercise Price |  | $ 3.81 | $ 4.21 |
Granted, Weighted-Average Exercise Price |  |  | 3.41 |
Ending balance, Weighted-Average Exercise Price |  | $ 3.81 | $ 3.81 | $ 4.21
Balance, Weighted-Average Remaining Contractual Term |  | 7 years 8 months 12 days | 8 years 8 months 12 days | 7 years 7 months 6 days
Weighted average remaining contractual term |  |  | 10 years |
Vested and exercisable, Aggregate Intrinsic Value | [1] | $ 32 |  |
Number of shares vested |  | 70,000 |  |
Director Stock Option [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Beginning balance, Number of Shares |  | 207,500 | 207,500 |
Granted, Number of Shares |  | 0 | 0 |
Exercised, Number of Shares |  | 0 | 0 |
Canceled/forfeited/expired, Number of Shares |  | 0 | 0 |
Ending balance, Number of Shares |  | 207,500 | 207,500 | 207,500
Beginning balance, Weighted-Average Exercise Price |  | $ 4.62 | $ 4.62 |
Ending balance, Weighted-Average Exercise Price |  | $ 4.62 | $ 4.62 | $ 4.62
Balance, Weighted-Average Remaining Contractual Term |  | 5 years 4 months 24 days | 6 years 4 months 24 days | 7 years 4 months 24 days
Vested and exercisable, Aggregate Intrinsic Value | [1] | $ 0 |  |
Number of shares vested |  | 202,500 |  |
[1] | The aggregate intrinsic value is calculated as approximately the difference between the weighted average exercise price of the underlying awards and the Company’s estimated current fair market value at December 31, 2017.

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired. + 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 (c)(1)(iv)(3)-(4) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + 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 (c)(1)(i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest exercisable or convertible options. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + 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 (e)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for option awards outstanding, 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 (e)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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