Consolidated Statements of Stockholders' Equity - USD ($)	Class A Common Stock	Class B Common Stock	Additional Paid In Capital	Retained Earnings	Treasury Stock	Accumulated Other Comprehensive Income (Loss)	Total
Balance at Dec. 29, 2012	$ 1,541,766	$ 171,694	$ 68,953,487	$ 12,154,745	$ (15,668,055)	$ 9,245	$ 67,162,882
Balance (in shares) at Dec. 29, 2012	15,417,656	1,716,937
Increase (decrease) in Stockholders' equity
Net income				6,425,876			6,425,876
Unrealized loss on hedge activity, net of tax						(19,864)	(19,864)
Unrealized holding loss on investments, net of tax						(32,487)	(32,487)
Common stock dividend	$ 68,628	$ 8,584	3,235,200	(3,312,412)
Common stock dividend (in shares)	686,278	85,846
Exercise of stock options	$ 9,554		131,843				141,397
Exercise of stock options (in shares)	95,548
Issuance of restricted stock			141,847				141,847
Stock-based compensation	$ 3,301		257,215				260,516
Stock-based compensation (in shares)	33,006
Conversion of Class B shares to Class A shares	$ 3,083	$ (3,083)
Conversion of Class B shares to Class A shares (in shares)	30,834	(30,834)
Balance at Dec. 28, 2013	$ 1,626,332	$ 177,195	72,719,592	15,268,209	(15,668,055)	(43,106)	74,080,167
Balance (in shares) at Dec. 28, 2013	16,263,322	1,771,949
Increase (decrease) in Stockholders' equity
Net income				6,902,531			6,902,531
Unrealized loss on hedge activity, net of tax						(5,444)	(5,444)
Unrealized holding loss on investments, net of tax						(17,023)	(17,023)
Cash dividends declared				(826,805)			(826,805)
Exercise of stock options	$ 16,438		394,264				410,702
Exercise of stock options (in shares)	164,382
Issuance of restricted stock	$ 4,859		304,668				309,527
Issuance of restricted stock (in shares)	48,594
Stock-based compensation	$ 2,600		176,150				178,750
Stock-based compensation (in shares)	25,998
Other	$ (17,751)		(1,106,573)		1,124,324
Other (in shares)	(177,518)
Balance at Dec. 27, 2014	$ 1,632,478	$ 177,195	72,488,101	21,343,935	(14,543,731)	(65,573)	81,032,405
Balance (in shares) at Dec. 27, 2014	16,324,778	1,771,949
Increase (decrease) in Stockholders' equity
Net income				12,875,269			12,875,269
Unrealized loss on hedge activity, net of tax						(2,459)	(2,459)
Unrealized holding loss on investments, net of tax						(115,482)	(115,482)
Cash dividends declared				(6,435,333)			(6,435,333)
Exercise of stock options	$ 17,943		532,141				550,084
Exercise of stock options (in shares)	179,434
Excess tax benefits from exercise of stock options			63,030				63,030
Issuance of restricted stock	$ 6,889		578,834				585,723
Issuance of restricted stock (in shares)	68,893
Stock-based compensation	$ 2,441		190,059				192,500
Stock-based compensation (in shares)	24,409
Conversion of Class B shares to Class A shares	$ 2,947	$ (2,947)
Conversion of Class B shares to Class A shares (in shares)	29,467	(29,467)
Treasury stock purchased					(157,308)		(157,308)
Balance at Dec. 26, 2015	$ 1,662,698	$ 174,248	$ 73,852,165	$ 27,783,871	$ (14,701,039)	$ (183,514)	$ 88,588,429
Balance (in shares) at Dec. 26, 2015	16,626,981	1,742,482