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CASH AND EQUIVALENTS AND MARKETABLE SECURITIES (Details) - USD ($)
Jul. 01, 2017
Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Debt Securities, Amortized Cost Basis $ 54,564,986 $ 61,667,245
Unrealized Gains 0 0
Unrealized Losses (197,735) (291,844)
Fair Value 54,367,251 61,375,401
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]    
Less than one year 33,445,671  
One to five years 17,975,560  
Greater than five years 2,946,020  
Available-for-sale Securities 54,367,251  
U.S. government and agency backed securities    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Debt Securities, Amortized Cost Basis 36,579,935 36,343,817
Unrealized Gains 0 0
Unrealized Losses (154,442) (252,556)
Fair Value 36,425,493 36,091,261
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]    
Less than one year 16,462,663  
One to five years 17,016,810  
Greater than five years 2,946,020  
Available-for-sale Securities 36,425,493  
Corporate debt and certificates of deposit    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Debt Securities, Amortized Cost Basis 17,985,051 25,323,428
Unrealized Gains 0 0
Unrealized Losses (43,293) (39,288)
Fair Value 17,941,758 $ 25,284,140
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]    
Less than one year 16,983,008  
One to five years 958,750  
Greater than five years 0  
Available-for-sale Securities $ 17,941,758