FAIR VALUE MEASUREMENTS (Details) (USD $) | Mar. 29, 2014 | Dec. 28, 2013 |
Level 1 | ' | ' |
Fair Value Measurements [Line Items] | ' | ' |
Financial Instruments, Owned, at Fair Value | $41,119,175 | $34,731,771 |
Level 1 | Money Markets, Cash and Equivalents | ' | ' |
Fair Value Measurements [Line Items] | ' | ' |
Financial Instruments, Owned, at Fair Value | 14,811,610 | 16,756,666 |
Level 1 | U.S. Government Securities | ' | ' |
Fair Value Measurements [Line Items] | ' | ' |
Financial Instruments, Owned, at Fair Value | 25,013,792 | 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 | 1,293,773 | 1,433,102 |
Level 2 | ' | ' |
Fair Value Measurements [Line Items] | ' | ' |
Financial Instruments, Owned, at Fair Value | 66,320,420 | 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 | 48,486,311 | 51,742,389 |
Level 2 | Corporate Debt | ' | ' |
Fair Value Measurements [Line Items] | ' | ' |
Financial Instruments, Owned, at Fair Value | 4,709,186 | 12,984,331 |
Level 2 | Certificates of Deposit | ' | ' |
Fair Value Measurements [Line Items] | ' | ' |
Financial Instruments, Owned, at Fair Value | 13,124,923 | 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 | 107,439,595 | 114,162,303 |
Estimate of Fair Value | Money Markets, Cash and Equivalents | ' | ' |
Fair Value Measurements [Line Items] | ' | ' |
Financial Instruments, Owned, at Fair Value | 14,811,610 | 16,756,666 |
Estimate of Fair Value | U.S. Government Securities | ' | ' |
Fair Value Measurements [Line Items] | ' | ' |
Financial Instruments, Owned, at Fair Value | 73,500,103 | 68,284,392 |
Estimate of Fair Value | Corporate Debt | ' | ' |
Fair Value Measurements [Line Items] | ' | ' |
Financial Instruments, Owned, at Fair Value | 4,709,186 | 12,984,331 |
Estimate of Fair Value | Certificates of Deposit | ' | ' |
Fair Value Measurements [Line Items] | ' | ' |
Financial Instruments, Owned, at Fair Value | 13,124,923 | 14,703,812 |
Estimate of Fair Value | Vuzix [Member] | ' | ' |
Fair Value Measurements [Line Items] | ' | ' |
Financial Instruments, Owned, at Fair Value | $1,293,773 | $1,433,102 |