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Contingencies and litigations (Details) (USD $) | Dec. 31, 2012 | Apr. 30, 2012 | Feb. 14, 2012 | Mar. 31, 2011 | Dec. 31, 2009 | Jan. 31, 2006
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Acutal damages found by jury in millions |  |  |  |  | 66.5 |
Actual damages in tortous interference claim millions |  |  |  |  | 31.16 |
Exemplary damages and individual and Eurenergy millions |  |  |  |  | 8.5 |
reinstated the jury award of actual damages jointly and severely against The individual and EurEnergy millions |  |  | 66.5 |  |  |
received an invoice from Chesapeake |  |  |  |  |  | $ 556,217
Chesapeake received a summary judgment award |  |  |  | 686,874 |  |
Recorded a liability due Chesapeake | 491,000 |  |  |  |  |
Company attempted to acquire Sterling and invested a total of approximately |  |  |  |  | 400,000 |
Investment in Sterling written off |  |  |  |  | 50,000 |
Settlement with Sterling and payment |  | $ 112,500 |  |  |  |

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