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CASH AND EQUIVALENTS AND MARKETABLE SECURITIES (Details) - USD ($) | Jun. 30, 2018 | Dec. 30, 2017
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Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 31,095,830 | $ 44,204,201
Unrealized Losses | (414,701) | (296,744)
Fair Value | 30,681,129 | 43,907,457
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract] |  |
Less than one year | 13,034,091 |
One to five years | 17,647,038 |
Greater than five years | 0 |
Available-for-sale Securities | 30,681,129 |
U.S. government and agency backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 23,827,644 | 35,014,593
Unrealized Losses | (409,130) | (288,782)
Fair Value | 23,418,514 |
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract] |  |
Less than one year | 11,991,930 |
One to five years | 11,426,584 |
Greater than five years | 0 |
Available-for-sale Securities | 23,418,514 | 34,725,811
Corporate Debt Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 7,268,186 | 8,988,608
Unrealized Losses | (5,571) | (7,702)
Fair Value | 7,262,615 | 8,980,906
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract] |  |
Less than one year | 1,042,161 |
One to five years | 6,220,454 |
Greater than five years | 0 |
Available-for-sale Securities | 7,262,615 |
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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