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Investments: (Details 2) (USD $)
3 Months Ended 9 Months Ended
Sep. 29, 2012
Sep. 29, 2012
Sep. 29, 2012
Tomsten
Sep. 28, 2013
Tomsten
Dec. 29, 2012
Tomsten
Sep. 28, 2013
Investment in senior subordinated promissory notes in BridgeFunds
Dec. 29, 2012
Investment in senior subordinated promissory notes in BridgeFunds
Investments              
Investment at cost       $ 8,500,000   $ 2,000,000  
Investment owned as a percentage of outstanding common stock       22.00%      
Losses from equity investments 372,300 650,400 650,400        
Carrying amount of investment       $ 0 $ 0 $ 0 $ 0