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Summary of significant accounting policies (Details) (USD $)
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12 Months Ended | ||
|---|---|---|---|
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Dec. 31, 2011
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Dec. 31, 2012
Concourse Communications Detroit, LLC
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Dec. 31, 2012
Chicago Concourse Development Group, LLC
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| 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 | ||