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Common Stock Options And Stock Purchase Plan (Schedule Of Stock Options Activity) (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Exercised, Number of Shares |  | 0 | 0 |
Employee Stock Option [Member] |  |  |  |
Beginning balance, Number of Shares |  | 50,000 | 61,980 |
Granted, Number of Shares |  | 0 | 0 |
Exercised, Number of Shares |  | 0 | 0 |
Canceled/forfeited/expired, Number of Shares |  | 0 | 11,980 |
Ending balance, Number of Shares |  | 50,000 | 50,000 | 61,980
Beginning balance, Weighted-Average Exercise Price |  | $ 4.21 | $ 4.20 |
Canceled/forfeited/expired, Weighted-Average Exercise Price |  |  | 4.16 |
Ending balance, Weighted-Average Exercise Price |  | $ 4.21 | $ 4.21 | $ 4.20
Balance, Weighted-Average Remaining Contractual Term |  | 7 years 7 months 6 days | 8 years 7 months 6 days | 9 years 8 months 12 days
Vested and exercisable, Aggregate Intrinsic Value | [1] | $ 0 |  |
Number of shares vested |  | 50,000 |  |
Director Stock Option [Member] |  |  |  |
Beginning balance, Number of Shares |  | 207,500 | 185,000 |
Granted, Number of Shares |  | 0 | 25,000 |
Exercised, Number of Shares |  | 0 | 0 |
Canceled/forfeited/expired, Number of Shares |  | 0 | 2,500 |
Ending balance, Number of Shares |  | 207,500 | 207,500 | 185,000
Beginning balance, Weighted-Average Exercise Price |  | $ 4.62 | $ 4.64 |
Granted, Weighted-Average Exercise Price |  |  | 4.39 |
Canceled/forfeited/expired, Weighted-Average Exercise Price |  |  | 4.15 |
Ending balance, Weighted-Average Exercise Price |  | $ 4.62 | $ 4.62 | $ 4.64
Balance, Weighted-Average Remaining Contractual Term |  | 7 years 4 months 24 days | 8 years 4 months 24 days | 9 years 6 months
Sharebased Compensation Arrangement by Sharebased Payment Award Option Granted Weighted Average Remaining Contractual Term |  |  | 10 years |
Vested and exercisable, Aggregate Intrinsic Value | [1] | $ 0 |  |
Number of shares vested |  | 122,500 |  |
[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, 2015.

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- Definition Sharebased Compensation Arrangement by Sharebased Payment Award Option Granted Weighted Average Remaining Contractual Term - Average Weighted Term on Options Granted During Year + 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=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average price of options that were either forfeited or 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=6415400&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=6415400&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=6415400&loc=d3e5070-113901 + Details
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- Definition Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of fully vested and expected to vest options that are exercisable. + 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=6415400&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=6415400&loc=d3e5070-113901 + Details
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- Definition Number of share options (or share units) exercised during the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.28,29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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