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. 31, 2011	$ 1,533,061	$ 171,694	$ 71,463,799	$ 321,760	$ (18,564,266)	$ 7,299	$ 54,933,347
Balance (in shares) at Dec. 31, 2011	15,330,614	1,716,937
Increase (decrease) in Stockholders' equity
Net income				11,832,985			11,832,985
Unrealized holding gain (loss) on investments, net of tax						1,946	1,946
Issuance of 350,000 shares of treasury stock			(2,896,211)		2,896,211
Exercise of stock options	5,881		94,528				100,409
Exercise of stock options (in shares)	58,804
Stock-based compensation	2,824		291,371				294,195
Stock-based compensation (in shares)	28,238
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 gain (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 gain (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			176,150				178,750
Stock-based compensation	2,600
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