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Shareholders' Equity (Details) (USD $) |  |  | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2014 | Dec. 31, 2013 | Jun. 30, 2014 Employee Stock Options [Member] | Jun. 30, 2013 Employee Stock Options [Member] | Jun. 30, 2014 Employee Stock Options [Member] | Jun. 30, 2013 Employee Stock Options [Member] | Jun. 30, 2014 Director Stock Options [Member] | Jun. 30, 2013 Director Stock Options [Member] | Jun. 30, 2014 Director Stock Options [Member] | Jun. 30, 2013 Director Stock Options [Member] | Jun. 30, 2014 2001 Stock Compensation Plan [Member] | Jun. 30, 2013 2001 Stock Compensation Plan [Member] | Jun. 30, 2013 2001 Stock Compensation Plan [Member] | Jun. 30, 2014 Common Stock [Member] | Jun. 30, 2014 Additional Paid-In Capital [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued of common stock (in shares) |  |  |  |  |  |  |  |  |  |  | 0 | 15,000 | 30,000 |  |
Changes in common stock [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance | $ 109,426,000 | $ 109,057,000 |  |  |  |  |  |  |  |  |  |  |  | $ 277,000 | $ 123,510,000
Balance (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  | 27,735,878 |
Exercise of employee stock options |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,000 | (64,000)
Exercise of employee stock options (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  | 153,447 |
Exercise of outside director options |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 8,000
Exercise of outside director options (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,372 |
Expense of employee options vesting |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 86,000
Expense of outside director options vesting |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 60,000
Balance | 109,426,000 | 109,057,000 |  |  |  |  |  |  |  |  |  |  |  | 279,000 | 123,600,000
Balance (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  | 27,896,697 |
Options [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding beginning balance (in shares) |  |  |  |  | 2,500,949 |  |  |  | 146,000 |  |  |  |  |  |
Granted (in shares) |  |  |  |  | 0 |  |  |  | 0 |  |  |  |  |  |
Forfeited (in shares) |  |  |  |  | (3,333) |  |  |  | 0 |  |  |  |  |  |
Expired (in shares) |  |  |  |  | 0 |  |  |  | 0 |  |  |  |  |  |
Exercised (in shares) |  |  |  |  | (390,203) |  |  |  | (13,334) |  |  |  |  |  |
Outstanding ending balance (in shares) |  |  | 2,107,413 |  | 2,107,413 |  | 132,666 |  | 132,666 |  |  |  |  |  |
Exercisable (in shares) |  |  | 1,747,416 |  | 1,747,416 |  | 84,000 |  | 84,000 |  |  |  |  |  |
Weighted Average Exercise Price [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning Balance (in dollars per share) |  |  |  |  | $ 3.60 |  |  |  | $ 2.93 |  |  |  |  |  |
Granted (in dollars per share) |  |  |  |  | $ 0 |  |  |  | $ 0 |  |  |  |  |  |
Forfeited (in dollars per share) |  |  |  |  | $ 2.32 |  |  |  | $ 0 |  |  |  |  |  |
Expired (in dollars per share) |  |  |  |  | $ 0 |  |  |  | $ 0 |  |  |  |  |  |
Exercised (in dollars per share) |  |  |  |  | $ 2.46 |  |  |  | $ 2.72 |  |  |  |  |  |
Ending Balance (in dollars per share) |  |  | $ 3.82 |  | $ 3.82 |  | $ 2.96 |  | $ 2.96 |  |  |  |  |  |
Exercisable (in dollars per share) |  |  | $ 4.16 |  | $ 4.16 |  | $ 3.31 |  | $ 3.31 |  |  |  |  |  |
Weighted Average Remaining Contractual Life - Years |  |  |  |  | 4 years 1 month 20 days |  |  |  | 6 years 9 months 11 days |  |  |  |  |  |
Aggregate intrinsic value of options outstanding |  |  | 1,738,000 |  | 1,738,000 |  | 189,000 |  | 189,000 |  |  |  |  |  |
Share-based compensation expense |  |  | 43,000 | 16,000 | 86,000 | 32,000 | 44,000 | 16,000 | 60,000 | 31,000 | 0 | 25,000 | 48,000 |  |
Total unrecognized expense for the option plan |  |  | 277,000 |  | 277,000 |  | 44,000 |  | 44,000 |  |  |  |  |  |
Weighted average remaining vesting period |  |  | 1 year 9 months 14 days |  |  |  | 1 year 4 months 20 days |  |  |  |  |  |  |  |
Intrinsic value of option exercised |  |  | $ 584,000 |  | $ 724,000 |  | $ 0 |  | $ 28,000 |  |  |  |  |  |

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the 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)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable 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)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, 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 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. + 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)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements. + 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)(4) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition 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. + 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) -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 Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + 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 + 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 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=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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