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Stock Option Plans (Details 5) (Officer and Employee Plans [Member], USD $) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Exercise Prices | $ 3.86 | $ 4.63 | $ 5.79 | $ 6.18
Number Outstanding | 670,300 | 572,600 | 520,900 | 799,675
Options Outstanding, Weighted Average Remaining Life | 6 years 2 months 12 days |  |  |
Options Outstanding, Weighted Average Exercise Price | $ 3.86 |  |  |
Options, Number Exercisable | 274,680 | 295,415 | 385,270 |
Options Exercisable, Weighted Average Exercise Price | $ 6.82 |  |  |
Exercise Price One [Member] |  |  |  |
Exercise Prices | $ 3.63 |  |  |
Number Outstanding | 49,000 |  |  |
Options Outstanding, Weighted Average Remaining Life | 2 months 12 days |  |  |
Options Outstanding, Weighted Average Exercise Price | $ 3.63 |  |  |
Options, Number Exercisable | 49,000 |  |  |
Options Exercisable, Weighted Average Exercise Price | $ 3.63 |  |  |
Exercise Price Two [Member] |  |  |  |
Exercise Prices | $ 5.44 |  |  |
Number Outstanding | 65,640 |  |  |
Options Outstanding, Weighted Average Remaining Life | 1 year 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 Three [Member] |  |  |  |
Exercise Prices | $ 9.23 |  |  |
Number Outstanding | 39,910 |  |  |
Options Outstanding, Weighted Average Remaining Life | 2 years 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 Four [Member] |  |  |  |
Exercise Prices | $ 13.25 |  |  |
Number Outstanding | 17,000 |  |  |
Options Outstanding, Weighted Average Remaining Life | 3 years 2 months 12 days |  |  |
Options Outstanding, Weighted Average Exercise Price | $ 13.25 |  |  |
Options, Number Exercisable | 17,000 |  |  |
Options Exercisable, Weighted Average Exercise Price | $ 13.25 |  |  |
Exercise Price Five [Member] |  |  |  |
Exercise Prices | $ 15.25 |  |  |
Number Outstanding | 11,950 |  |  |
Options Outstanding, Weighted Average Remaining Life | 4 years 2 months 12 days |  |  |
Options Outstanding, Weighted Average Exercise Price | $ 15.25 |  |  |
Options, Number Exercisable | 11,950 |  |  |
Options Exercisable, Weighted Average Exercise Price | $ 15.25 |  |  |
Exercise Price Six [Member] |  |  |  |
Exercise Prices | $ 15.2 |  |  |
Number Outstanding | 2,750 |  |  |
Options Outstanding, Weighted Average Remaining Life | 4 years 3 months 18 days |  |  |
Options Outstanding, Weighted Average Exercise Price | $ 15.2 |  |  |
Options, Number Exercisable | 2,750 |  |  |
Options Exercisable, Weighted Average Exercise Price | $ 15.2 |  |  |
Exercise Price Seven [Member] |  |  |  |
Exercise Prices | $ 7.99 |  |  |
Number Outstanding | 45,500 |  |  |
Options Outstanding, Weighted Average Remaining Life | 5 years 2 months 12 days |  |  |
Options Outstanding, Weighted Average Exercise Price | $ 7.99 |  |  |
Options, Number Exercisable | 45,500 |  |  |
Options Exercisable, Weighted Average Exercise Price | $ 7.99 |  |  |
Exercise Price Eight [Member] |  |  |  |
Exercise Prices | $ 3.6 |  |  |
Number Outstanding | 71,550 |  |  |
Options Outstanding, Weighted Average Remaining Life | 6 years 2 months 12 days |  |  |
Options Outstanding, Weighted Average Exercise Price | $ 3.6 |  |  |
Options, Number Exercisable | 42,930 |  |  |
Options Exercisable, Weighted Average Exercise Price | $ 3.6 |  |  |
Exercise Price Nine [Member] |  |  |  |
Exercise Prices | $ 1.7 |  |  |
Number Outstanding | 174,000 |  |  |
Options Outstanding, Weighted Average Remaining Life | 8 years 2 months 12 days |  |  |
Options Outstanding, Weighted Average Exercise Price | $ 1.7 |  |  |
Options, Number Exercisable | 0 |  |  |
Options Exercisable, Weighted Average Exercise Price | $ 0 |  |  |
Exercise Price Ten [Member] |  |  |  |
Exercise Prices | $ 1.55 |  |  |
Number Outstanding | 3,000 |  |  |
Options Outstanding, Weighted Average Remaining Life | 8 years 3 months 18 days |  |  |
Options Outstanding, Weighted Average Exercise Price | $ 1.55 |  |  |
Options, Number Exercisable | 0 |  |  |
Options Exercisable, Weighted Average Exercise Price | $ 0 |  |  |
Exercise Price Eleven [Member] |  |  |  |
Exercise Prices | $ 1.1 |  |  |
Number Outstanding | 5,000 |  |  |
Options Outstanding, Weighted Average Remaining Life | 8 years 7 months 6 days |  |  |
Options Outstanding, Weighted Average Exercise Price | $ 1.1 |  |  |
Options, Number Exercisable | 0 |  |  |
Options Exercisable, Weighted Average Exercise Price | $ 0 |  |  |
Exercise Price Twelve [Member] |  |  |  |
Exercise Prices | $ 1.02 |  |  |
Number Outstanding | 5,000 |  |  |
Options Outstanding, Weighted Average Remaining Life | 8 years 9 months 18 days |  |  |
Options Outstanding, Weighted Average Exercise Price | $ 1.02 |  |  |
Options, Number Exercisable | 0 |  |  |
Options Exercisable, Weighted Average Exercise Price | $ 0 |  |  |
Exercise Price Thirteen [Member] |  |  |  |
Exercise Prices | $ 1.65 |  |  |
Number Outstanding | 180,000 |  |  |
Options Outstanding, Weighted Average Remaining Life | 9 years 2 months 12 days |  |  |
Options Outstanding, Weighted Average Exercise Price | $ 1.65 |  |  |
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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(1)(c), d(2) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date, including vested options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(1)(b) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: 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 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)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(1)(a) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(1)(a) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + 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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