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CASH AND EQUIVALENTS AND MARKETABLE SECURITIES (Details) - USD ($) | Sep. 29, 2018 | Dec. 30, 2017
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 27,249,336 | $ 44,204,201
Unrealized Losses | (413,368) | (296,744)
Fair Value | 26,835,968 | 43,907,457
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract] |  |
Less than one year | 9,436,702 |
One to five years | 17,399,266 |
Greater than five years | 0 |
Available-for-sale Securities | 26,835,968 |
U.S. government and agency backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 16,070,511 | 35,014,593
Unrealized Losses | (414,404) | (288,782)
Fair Value | 15,656,107 |
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract] |  |
Less than one year | 6,223,207 |
One to five years | 9,432,900 |
Greater than five years | 0 |
Available-for-sale Securities | 15,656,107 | 34,725,811
Corporate Debt Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 11,178,825 | 8,988,608
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 1,036 |
Unrealized Losses |  | (7,702)
Fair Value | 11,179,861 | 8,980,906
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract] |  |
Less than one year | 3,213,495 |
One to five years | 7,966,366 |
Greater than five years | 0 |
Available-for-sale Securities | 11,179,861 |
Certificates of Deposit [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 0 | 201,000
Unrealized Losses | 0 | (260)
Fair Value | $ 0 | $ 200,740

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