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Asset Liquidation Investments and Other Investments (Details Textual) (USD $) In Thousands, unless otherwise specified |  |  |  |  |  |  |  |  | 3 Months Ended |  | 3 Months Ended |  | 3 Months Ended |
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Mar. 31, 2013 | Dec. 31, 2012 | Mar. 31, 2013 Knight's Bridge Capital Partners Internet Fund No. 1 GP LLC [Member] | Dec. 31, 2012 Knight's Bridge Capital Partners Internet Fund No. 1 GP LLC [Member] | Dec. 31, 2007 Knight's Bridge Capital Partners Internet Fund No. 1 GP LLC [Member] | Jun. 30, 2009 KPL, LLC [Member] | Mar. 31, 2013 Polaroid Corporation [Member] | Dec. 31, 2012 Polaroid Corporation [Member] | Mar. 31, 2013 Polaroid Corporation [Member] Class A [Member] | Dec. 31, 2012 Polaroid Corporation [Member] Class A [Member] | Mar. 31, 2013 Polaroid Corporation [Member] Class D [Member] | Dec. 31, 2012 Polaroid Corporation [Member] Class D [Member] | Mar. 31, 2013 Polaroid Corporation [Member] Limited Partner [Member] | Jun. 30, 2009 Polaroid [Member]
Equity Method Investment, Ownership Percentage |  |  |  |  | 33.33% |  |  |  |  |  |  |  |  | 5.00%
Non-Asset Liquidation Equity Investment Acquired |  |  |  |  | $ 20 |  | $ 3,109 | $ 3,053 | $ 2,492 | $ 2,447 | $ 617 | $ 606 |  |
Net investment at balance sheet date | 1,729 | 2,426 | 21 | 20 |  |  | 1,708 | 2,406 | 1,369 | 1,930 | 339 | 476 |  |
Long-term Investments |  |  |  |  |  | 19,000 |  |  |  |  |  |  |  | 55,000
Limited Liability Company (LLC) or Limited Partnership (LP), Members or Limited Partners, Ownership Interest |  |  |  |  |  |  |  |  |  |  |  |  | 95.24% |
Management Fee Percentage |  |  |  |  |  |  |  |  |  |  | 2.00% |  |  |
Annual Management Fees on Investment |  |  |  |  |  |  |  |  | $ 40 |  | $ 11 |  |  |
Preferred Return on Investment |  |  |  |  |  |  |  |  | 8.00% |  | 10.00% |  |  |
Managing Partner, Carried Interest |  |  |  |  |  |  |  |  | 20.00% |  | 20.00% |  |  |

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- Definition The management fees percentage payable to the Managing Partner, which is a percentage of committed and/or invested capital. + References No definition available. + Details
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- Definition The percentage of carried interest available to the Managing Partner after return of all capital contributed by the investors and payment of preferred return to the investors. + References No definition available. + Details
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- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 159 -Paragraph 18 -Subparagraph f -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 18 -Paragraph 20 -Subparagraph a (1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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