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CASH AND EQUIVALENTS AND MARKETABLE SECURITIES (Tables)
 6 Months Ended
Jun. 30, 2018
Cash and Equivalents and Marketable Securities Disclosure [Abstract]  
Cash Cash Equivalents and Marketable Securities Table
Investments in available-for-sale marketable debt securities are as follows at June 30, 2018 and December 30, 2017:
 
Amortized Cost

Unrealized Losses

Fair Value
 
2018

2017

2018

2017

2018

2017
U.S. government and agency backed securities
$
23,827,644


$
35,014,593


$
(409,130
)

$
(288,782
)

$
23,418,514


$
34,725,811

Corporate debt
7,268,186

 
8,988,608

 
(5,571
)
 
(7,702
)
 
7,262,615

 
8,980,906

Certificates of deposit
—


201,000


—


(260
)

—


200,740

Total
$
31,095,830

 
$
44,204,201

 
$
(414,701
)
 
$
(296,744
)
 
$
30,681,129

 
$
43,907,457
Marketable Debt Securities
The contractual maturity of the Company’s marketable debt securities is as follows at June 30, 2018:
 
Less than
One year
 
One to
Five years
 
Greater than
Five years
 
Total
U.S. government and agency backed securities
$
11,991,930

 
$
11,426,584

 
$
—

 
$
23,418,514

Corporate debt
1,042,161

 
6,220,454

 
—

 
7,262,615

Total
$
13,034,091

 
$
17,647,038

 
$
—

 
$
30,681,129