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Stock Option Plans (Details 5) (Officer and Employee Plans [Member], USD $) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Exercise Prices | $ 3.51 | $ 3.86 | $ 4.63 | $ 5.79
Number Outstanding | 810,825 | 670,300 | 572,600 | 520,900
Options Outstanding, Weighted Average Remaining Life | 6 years 6 months |  |  |
Options Outstanding, Weighted Average Exercise Price | $ 3.51 |  |  |
Options, Number Exercisable | 307,025 | 274,680 | 295,415 |
Options Exercisable, Weighted Average Exercise Price | $ 6.10 |  |  |
Exercise Price One [Member] |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Exercise Prices | $ 5.44 |  |  |
Number Outstanding | 65,640 |  |  |
Options Outstanding, Weighted Average Remaining Life | 2 months 12 days |  |  |
Options Outstanding, Weighted Average Exercise Price | $ 5.44 |  |  |
Options, Number Exercisable | 65,640 |  |  |
Options Exercisable, Weighted Average Exercise Price | $ 5.44 |  |  |
Exercise Price Two [Member] |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Exercise Prices | $ 9.23 |  |  |
Number Outstanding | 39,910 |  |  |
Options Outstanding, Weighted Average Remaining Life | 1 year 2 months 12 days |  |  |
Options Outstanding, Weighted Average Exercise Price | $ 9.23 |  |  |
Options, Number Exercisable | 39,910 |  |  |
Options Exercisable, Weighted Average Exercise Price | $ 9.23 |  |  |
Exercise Price Three [Member] |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Exercise Prices | $ 13.25 |  |  |
Number Outstanding | 16,800 |  |  |
Options Outstanding, Weighted Average Remaining Life | 2 years 2 months 12 days |  |  |
Options Outstanding, Weighted Average Exercise Price | $ 13.25 |  |  |
Options, Number Exercisable | 16,800 |  |  |
Options Exercisable, Weighted Average Exercise Price | $ 13.25 |  |  |
Exercise Price Four [Member] |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Exercise Prices | $ 15.25 |  |  |
Number Outstanding | 11,825 |  |  |
Options Outstanding, Weighted Average Remaining Life | 3 years 2 months 12 days |  |  |
Options Outstanding, Weighted Average Exercise Price | $ 15.25 |  |  |
Options, Number Exercisable | 11,825 |  |  |
Options Exercisable, Weighted Average Exercise Price | $ 15.25 |  |  |
Exercise Price Five [Member] |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Exercise Prices | $ 15.20 |  |  |
Number Outstanding | 2,750 |  |  |
Options Outstanding, Weighted Average Remaining Life | 3 years 3 months 18 days |  |  |
Options Outstanding, Weighted Average Exercise Price | $ 15.20 |  |  |
Options, Number Exercisable | 2,750 |  |  |
Options Exercisable, Weighted Average Exercise Price | $ 15.20 |  |  |
Exercise Price Six [Member] |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Exercise Prices | $ 7.99 |  |  |
Number Outstanding | 45,100 |  |  |
Options Outstanding, Weighted Average Remaining Life | 4 years 2 months 12 days |  |  |
Options Outstanding, Weighted Average Exercise Price | $ 7.99 |  |  |
Options, Number Exercisable | 45,100 |  |  |
Options Exercisable, Weighted Average Exercise Price | $ 7.99 |  |  |
Exercise Price Seven [Member] |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Exercise Prices | $ 3.60 |  |  |
Number Outstanding | 69,800 |  |  |
Options Outstanding, Weighted Average Remaining Life | 5 years 2 months 12 days |  |  |
Options Outstanding, Weighted Average Exercise Price | $ 3.60 |  |  |
Options, Number Exercisable | 69,800 |  |  |
Options Exercisable, Weighted Average Exercise Price | $ 3.60 |  |  |
Exercise Price Eight [Member] |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Exercise Prices | $ 1.70 |  |  |
Number Outstanding | 171,000 |  |  |
Options Outstanding, Weighted Average Remaining Life | 7 years 2 months 12 days |  |  |
Options Outstanding, Weighted Average Exercise Price | $ 1.70 |  |  |
Options, Number Exercisable | 51,300 |  |  |
Options Exercisable, Weighted Average Exercise Price | $ 1.70 |  |  |
Exercise Price Nine [Member] |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Exercise Prices | $ 1.55 |  |  |
Number Outstanding | 3,000 |  |  |
Options Outstanding, Weighted Average Remaining Life | 7 years 3 months 18 days |  |  |
Options Outstanding, Weighted Average Exercise Price | $ 1.55 |  |  |
Options, Number Exercisable | 900 |  |  |
Options Exercisable, Weighted Average Exercise Price | $ 1.55 |  |  |
Exercise Price Ten [Member] |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Exercise Prices | $ 1.10 |  |  |
Number Outstanding | 5,000 |  |  |
Options Outstanding, Weighted Average Remaining Life | 7 years 7 months 6 days |  |  |
Options Outstanding, Weighted Average Exercise Price | $ 1.10 |  |  |
Options, Number Exercisable | 1,500 |  |  |
Options Exercisable, Weighted Average Exercise Price | $ 1.10 |  |  |
Exercise Price Eleven [Member] |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Exercise Prices | $ 1.02 |  |  |
Number Outstanding | 5,000 |  |  |
Options Outstanding, Weighted Average Remaining Life | 7 years 9 months 18 days |  |  |
Options Outstanding, Weighted Average Exercise Price | $ 1.02 |  |  |
Options, Number Exercisable | 1,500 |  |  |
Options Exercisable, Weighted Average Exercise Price | $ 1.02 |  |  |
Exercise Price Twelve [Member] |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Exercise Prices | $ 1.65 |  |  |
Number Outstanding | 177,000 |  |  |
Options Outstanding, Weighted Average Remaining Life | 8 years 2 months 12 days |  |  |
Options Outstanding, Weighted Average Exercise Price | $ 1.65 |  |  |
Options, Number Exercisable | 0 |  |  |
Options Exercisable, Weighted Average Exercise Price | $ 0 |  |  |
Exercise Price Thirteen [Member] |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Exercise Prices | $ 2.37 |  |  |
Number Outstanding | 193,000 |  |  |
Options Outstanding, Weighted Average Remaining Life | 9 years 2 months 12 days |  |  |
Options Outstanding, Weighted Average Exercise Price | $ 2.37 |  |  |
Options, Number Exercisable | 0 |  |  |
Options Exercisable, Weighted Average Exercise Price | $ 0 |  |  |
Exercise Price Fourteen [Member] |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Exercise Prices | $ 2.50 |  |  |
Number Outstanding | 5,000 |  |  |
Options Outstanding, Weighted Average Remaining Life | 9 years 7 months 6 days |  |  |
Options Outstanding, Weighted Average Exercise Price | $ 2.50 |  |  |
Options, Number Exercisable | 0 |  |  |
Options Exercisable, Weighted Average Exercise Price | $ 0 |  |  |

X
- 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 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 exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and 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 -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 could acquire the underlying shares with respect to all outstanding stock options which are in the customized range of exercise prices. + 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)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term of outstanding stock options, 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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