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CASH AND EQUIVALENTS AND MARKETABLE SECURITIES (Details) - USD ($)
Mar. 31, 2018
Dec. 30, 2017
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost $ 37,292,449 $ 44,204,201
Unrealized Losses (418,854) (296,744)
Fair Value 36,873,595 43,907,457
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]    
Less than one year 18,212,608  
One to five years 17,712,047  
Greater than five years 948,940  
Available-for-sale Securities 36,873,595  
U.S. government and agency backed securities    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 29,821,596 35,014,593
Unrealized Losses (403,318) (288,782)
Fair Value 29,418,278  
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]    
Less than one year 16,970,998  
One to five years 11,498,340  
Greater than five years 948,940  
Available-for-sale Securities 29,418,278 34,725,811
Corporate Debt Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 7,270,853 8,988,608
Unrealized Losses (15,426) (7,702)
Fair Value 7,255,427 8,980,906
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]    
Less than one year 1,041,720  
One to five years 6,213,707  
Greater than five years 0  
Available-for-sale Securities 7,255,427  
Certificates of Deposit [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 200,000 201,000
Unrealized Losses (110) (260)
Fair Value 199,890 $ 200,740
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]    
Less than one year 199,890  
One to five years 0  
Greater than five years 0  
Available-for-sale Securities $ 199,890