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Investment in Leasing Operations: (Details 4) (Investment in leases, USD $)
12 Months Ended
Dec. 29, 2012
Dec. 31, 2011
Investment in leases
   
Activity in the allowance for credit losses for leasing operations    
Balance at beginning of period $ 803,800 $ 907,800
Provisions charged to expense (47,600) (43,400)
Recoveries 251,000 349,700
Deductions for amounts written-off (231,400) (410,300)
Balance at end of period $ 775,800 $ 803,800