v2.4.0.6

Summary of significant accounting policies (Details) (USD $) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2011 | Dec. 31, 2012 Concourse Communications Detroit, LLC | Dec. 31, 2012 Chicago Concourse Development Group, LLC
Principles of consolidation |  |  |
Percentage of ownership in subsidiaries |  | 70.00% | 70.00%
Reclassifications |  |  |
Reclassification from other assets to intangible assets | $ 335,000 |  |
Impact of Reclassification on Net Income | 0 |  |
Impact of Reclassification on Stockholders Equity | $ 0 |  |

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