v2.4.0.6

Income Taxes (Details Textual) (USD $) | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Income Taxes (Textual) [Abstract] |  |  |
Qualified domestic production activity deduction | $ 1,522,000 | $ 1,511,000 | $ 1,198,000
Effective tax rate | 5.10% | 2.00% | 5.30%
Income tax payments | 15,000,000 | 16,900,000 | 7,800,000
Reserve for uncertain tax positions | 0 |  |
Date of enactment of American Taxpayer Relief Act | Jan. 02, 2013 |  |
Extended expiry date | Dec. 31, 2013 |  |
Research and development tax credit | 77,000 |  |
Alternative fuel tax credit | $ 127,000 |  |
Research and Development Expense [Member] |  |  |
Tax Credit Carryforward [Line Items] |  |  |
Expiry date | Dec. 31, 2011 |  |

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- Definition The portion of the difference between the effective income tax rate and domestic federal statutory income tax rate attributable to the deduction for qualified production activities received under enacted tax laws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=6889476&loc=d3e330036-122817 + Details
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