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Financial Instruments (Marketable Debt Securities) (Details) - USD ($)	Dec. 30, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 44,204,201	$ 61,667,245
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	0	439
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	(296,744)	(292,283)
Available-for-sale Securities, Debt Securities	43,907,457	61,375,401
Less than One year	22,306,706
One to Five years	19,676,311
Greater than Five years	1,924,440
Fair Value	43,907,457
U.S. government and agency backed securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	35,014,593	36,343,817
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	0	0
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	(288,782)	(252,556)
Available-for-sale Securities, Debt Securities	34,725,811
Less than One year	20,390,246
One to Five years	12,411,125
Greater than Five years	1,924,440
Fair Value	34,725,811	36,091,261
Corporate Debt Securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	8,988,608	7,596,755
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	0	0
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	(7,702)	(39,727)
Available-for-sale Securities, Debt Securities	8,980,906	7,557,028
Less than One year	1,715,720
One to Five years	7,265,186
Greater than Five years	0
Fair Value	8,980,906
Certificates of Deposit
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	201,000	17,726,673
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	0	439
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	(260)	0
Available-for-sale Securities, Debt Securities	200,740	$ 17,727,112
Less than One year	200,740
One to Five years	0
Greater than Five years	0
Fair Value	$ 200,740

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Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale.

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