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FAIR VALUE MEASUREMENTS (Details) (USD $)
Jun. 28, 2014
Dec. 28, 2013
Level 1
    
Fair Value Measurements [Line Items]    
Financial Instruments, Owned, at Fair Value $ 37,097,648 $ 34,731,771
Level 1 | Money Markets, Cash and Equivalents
    
Fair Value Measurements [Line Items]    
Financial Instruments, Owned, at Fair Value 13,305,327 16,756,666
Level 1 | U.S. Government Securities
    
Fair Value Measurements [Line Items]    
Financial Instruments, Owned, at Fair Value 22,809,054 16,542,003
Level 1 | Corporate Debt
    
Fair Value Measurements [Line Items]    
Financial Instruments, Owned, at Fair Value      
Level 1 | Certificates of Deposit
    
Fair Value Measurements [Line Items]    
Financial Instruments, Owned, at Fair Value      
Level 1 | Vuzix [Member]
    
Fair Value Measurements [Line Items]    
Financial Instruments, Owned, at Fair Value 983,267 1,433,102
Level 2
    
Fair Value Measurements [Line Items]    
Financial Instruments, Owned, at Fair Value 62,784,462 79,430,532
Level 2 | Money Markets, Cash and Equivalents
    
Fair Value Measurements [Line Items]    
Financial Instruments, Owned, at Fair Value      
Level 2 | U.S. Government Securities
    
Fair Value Measurements [Line Items]    
Financial Instruments, Owned, at Fair Value 42,131,457 51,742,389
Level 2 | Corporate Debt
    
Fair Value Measurements [Line Items]    
Financial Instruments, Owned, at Fair Value 7,534,933 12,984,331
Level 2 | Certificates of Deposit
    
Fair Value Measurements [Line Items]    
Financial Instruments, Owned, at Fair Value 13,118,072 14,703,812
Level 2 | Vuzix [Member]
    
Fair Value Measurements [Line Items]    
Financial Instruments, Owned, at Fair Value    0
Level 3
    
Fair Value Measurements [Line Items]    
Financial Instruments, Owned, at Fair Value 0 0
Level 3 | Money Markets, Cash and Equivalents
    
Fair Value Measurements [Line Items]    
Financial Instruments, Owned, at Fair Value 0 0
Level 3 | U.S. Government Securities
    
Fair Value Measurements [Line Items]    
Financial Instruments, Owned, at Fair Value 0 0
Level 3 | Corporate Debt
    
Fair Value Measurements [Line Items]    
Financial Instruments, Owned, at Fair Value 0 0
Level 3 | Certificates of Deposit
    
Fair Value Measurements [Line Items]    
Financial Instruments, Owned, at Fair Value 0 0
Level 3 | Vuzix [Member]
    
Fair Value Measurements [Line Items]    
Financial Instruments, Owned, at Fair Value 0 0
Estimate of Fair Value
    
Fair Value Measurements [Line Items]    
Financial Instruments, Owned, at Fair Value 99,882,110 114,162,303
Estimate of Fair Value | Money Markets, Cash and Equivalents
    
Fair Value Measurements [Line Items]    
Financial Instruments, Owned, at Fair Value 13,305,327 16,756,666
Estimate of Fair Value | U.S. Government Securities
    
Fair Value Measurements [Line Items]    
Financial Instruments, Owned, at Fair Value 64,940,511 68,284,392
Estimate of Fair Value | Corporate Debt
    
Fair Value Measurements [Line Items]    
Financial Instruments, Owned, at Fair Value 7,534,933 12,984,331
Estimate of Fair Value | Certificates of Deposit
    
Fair Value Measurements [Line Items]    
Financial Instruments, Owned, at Fair Value 13,118,072 14,703,812
Estimate of Fair Value | Vuzix [Member]
    
Fair Value Measurements [Line Items]    
Financial Instruments, Owned, at Fair Value $ 983,267 $ 1,433,102