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CASH AND EQUIVALENTS AND MARKETABLE SECURITIES (Details) - USD ($)
Apr. 01, 2017
Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Debt Securities, Amortized Cost Basis $ 49,592,097 $ 61,667,245
Unrealized Gains 0 0
Unrealized Losses (234,594) (291,844)
Fair Value 49,357,503 61,375,401
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]    
Less than one year 28,980,115  
One to five years 16,459,088  
Greater than five years 3,918,300  
Available-for-sale Securities 49,357,503  
U.S. government and agency backed securities    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Debt Securities, Amortized Cost Basis 35,116,536 36,343,817
Unrealized Gains 0 0
Unrealized Losses (201,268) (252,556)
Fair Value 34,915,268 36,091,261
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]    
Less than one year 15,495,380  
One to five years 15,501,588  
Greater than five years 3,918,300  
Available-for-sale Securities 34,915,268  
Corporate debt and certificates of deposit    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Debt Securities, Amortized Cost Basis 14,475,561 25,323,428
Unrealized Gains 0 0
Unrealized Losses (33,326) (39,288)
Fair Value 14,442,235 $ 25,284,140
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]    
Less than one year 13,484,735  
One to five years 957,500  
Greater than five years 0  
Available-for-sale Securities $ 14,442,235