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Investments (Details 2) (USD $) | 12 Months Ended |  |  | 12 Months Ended |  | 0 Months Ended | 1 Months Ended | 12 Months Ended | 1 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 29, 2012 | Dec. 31, 2011 | Dec. 29, 2012 BridgeFunds, LLC | Dec. 31, 2011 BridgeFunds, LLC | Dec. 29, 2012 Tomsten | Dec. 31, 2011 Tomsten | Jun. 30, 2011 Tomsten | Jun. 30, 2011 Tomsten Rights Offering | Sep. 30, 2010 Investment in senior subordinated promissory notes in BridgeFunds | Oct. 31, 2004 Investment in senior subordinated promissory notes in BridgeFunds | Dec. 29, 2012 Investment in senior subordinated promissory notes in BridgeFunds | Dec. 31, 2011 Investment in senior subordinated promissory notes in BridgeFunds | Oct. 31, 2011 Investment in senior subordinated promissory notes in BridgeFunds BridgeFunds, LLC
Investments |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term investments |  | $ 3,817,400 |  | $ 1,324,500 |  | $ 2,492,900 |  |  |  |  |  |  |
Investment at cost |  |  |  |  | 8,500,000 |  |  | 1,000,000 |  |  |  |  |
Investment owned as a percentage of outstanding common stock |  |  |  |  | 22.00% |  |  |  |  |  |  |  |
Investment owned as a percentage of outstanding common stock prior to the entity's participation in rights offering |  |  |  |  |  |  | 18.30% |  |  |  |  |  |
Losses from equity investments | 2,492,900 | 515,800 |  |  | 697,300 | 515,800 |  |  |  |  |  |  |
Carrying amount of investment |  |  | 0 |  | 0 |  |  |  |  |  |  |  |
Commitment to lend pursuant to senior subordinated promissory note |  |  |  |  |  |  |  |  |  | 2,000,000 |  |  |
Annual rate of Interest (as a percent) |  |  |  |  |  |  |  |  | 15.00% | 12.00% |  |  |
Number of shares that can be purchased against the warrant |  |  |  |  |  |  |  |  |  |  |  |  | 257,000
Exercise price of warrant (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  | $ 1
Interest received |  |  |  |  |  |  |  |  |  |  | 0 | 28,300 |
Impairment charges | $ 1,324,400 | $ 883,100 |  |  | $ 1,800,000 |  |  |  |  |  | $ 1,324,400 | $ 883,100 |

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