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Restatement of previously issued financial statements due to correction of errors (Details Textual) (USD $)
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12 Months Ended | |||||
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Dec. 31, 2012
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Dec. 31, 2011
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Dec. 31, 2010
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Dec. 31, 2009
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Dec. 31, 2008
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Dec. 31, 2007
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| Provision for State Sales Tax | $ 470,000 | $ 266,000 | ||||
| Sales and Excise Tax Payable, Current | 736,000 | 266,000 | ||||
| Due from Affiliate, Noncurrent | 6,800,000 | |||||
| Impairment Charge On Note Receivable | 5,800,000 | |||||
| Impairment recovery on note receivable from affiliate | 1,200,000 | 4,300,000 | 300,000 | |||
| Revenue Period, Increase Decrease | 4,600,000 | |||||
| Deferred Revenue, Period Increase (Decrease) | $ 2,400,000 | |||||