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CASH AND EQUIVALENTS AND MARKETABLE SECURITIES (Details) - USD ($)	Sep. 24, 2016	Dec. 26, 2015
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis	$ 63,021,573	$ 61,120,471
Unrealized Gains	71,208	0
Unrealized Losses	(58,401)	(177,580)
Fair Value	63,034,380	60,942,891
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
Less than one year	33,396,486
One to five years	22,583,994
Greater than five years	7,053,900
Available-for-sale Securities	63,034,380
U.S. government and agency backed securities
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis	42,366,974	46,586,224
Unrealized Gains	71,208	0
Unrealized Losses	0	(121,561)
Fair Value	42,438,182	46,464,663
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
Less than one year	16,904,660
One to five years	18,479,622
Greater than five years	7,053,900
Available-for-sale Securities	42,438,182
Corporate debt and certificates of deposit
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis	20,654,599	14,534,247
Unrealized Gains	0	0
Unrealized Losses	(58,401)	(56,019)
Fair Value	20,596,198	$ 14,478,228
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
Less than one year	16,491,826
One to five years	4,104,372
Greater than five years	0
Available-for-sale Securities	$ 20,596,198

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