CASH AND EQUIVALENTS AND MARKETABLE SECURITIES (Details) - USD ($)	Jun. 25, 2016	Dec. 26, 2015
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis	$ 65,656,877	$ 61,120,471
Unrealized Gains	118,565	0
Unrealized Losses	(65,846)	(177,580)
Fair Value	65,709,596	60,942,891
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
Less than one year	34,030,930
One to five years	24,608,076
Greater than five years	7,070,590
Available-for-sale Securities	65,709,596
U.S. government and agency backed securities
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis	44,742,363	46,586,224
Unrealized Gains	118,565	0
Unrealized Losses	0	(121,561)
Fair Value	44,860,928	46,464,663
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
Less than one year	17,582,380
One to five years	20,207,958
Greater than five years	7,070,590
Available-for-sale Securities	44,860,928
Corporate debt and certificates of deposit
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis	20,914,514	14,534,247
Unrealized Gains	0	0
Unrealized Losses	(65,846)	(56,019)
Fair Value	20,848,668	$ 14,478,228
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
Less than one year	16,448,550
One to five years	4,400,118
Greater than five years	0
Available-for-sale Securities	$ 20,848,668