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CASH AND EQUIVALENTS AND MARKETABLE SECURITIES (Details) - USD ($)	Jun. 30, 2018	Dec. 30, 2017
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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