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Cost of revenues and general and administrative expenses (Details 1) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
General and administrative expenses | $ 14,542,817 | $ 13,651,650 | $ 11,329,648
Employee Costs [Member] |  |  |
General and administrative expenses | 5,751,142 | 5,265,360 | 4,219,915
Insurance [Member] |  |  |
General and administrative expenses | 968,662 | 965,003 | 951,715
Professional Fees [Member] |  |  |
General and administrative expenses | 2,097,294 | 3,112,678 | 2,805,146
Director's Fees and Expenses [Member] |  |  |
General and administrative expenses | 608,429 | 551,132 | 519,786
Depreciation [Member] |  |  |
General and administrative expenses | 421,851 | 252,303 | 340,969
Other Credit Derivatives [Member] |  |  |
General and administrative expenses | $ 4,695,439 | $ 3,505,174 | $ 2,492,117

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- Definition The aggregate total of expenses of managing and administering the affairs of an entity, including affiliates of the reporting entity, which are not directly or indirectly associated with the manufacture, sale or creation of a product or product line. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.4) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 + Details
Name: | us-gaap_GeneralAndAdministrativeExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration