CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)	9 Months Ended
	Sep. 24, 2016	Sep. 26, 2015
Cash flows from operating activities:
Net income	$ 17,052,848	$ 9,076,677
Adjustments to reconcile net income to net cash from operating activities:
Depreciation and amortization	2,582,551	2,698,741
Deferred income taxes	427,323	(29,138)
Stock-based compensation expense	708,097	572,173
Gain on sale of property, plant and equipment, net	(75,566)	(168,480)
Changes in operating assets and liabilities	(5,089,345)	(10,965,706)
Net cash provided by operating activities	15,605,908	1,184,267
Cash flows from investing activities:
Additions to property, plant and equipment	(2,430,228)	(3,500,431)
Proceeds from sale of property, plant, and equipment	113,800	408,834
Proceeds from sale of investments	23,000	1,029,000
Purchases of investments	(67,302)	(92,330)
Net cash used in investing activities	(2,360,730)	(2,154,927)
Cash flows from financing activities:
Proceeds from revolving line of credit and other long-term debt		38,570,153
Repayments of revolving line of credit and other long-term debt	(500,001)	(39,070,151)
Payments of cash dividends	(6,764,282)	(1,829,027)
Treasury stock purchased	(269,177)	(157,308)
Proceeds from exercise of stock options	70,826	528,033
Net cash used in financing activities	(7,462,634)	(1,958,300)
Change in cash and cash equivalents	5,782,544	(2,928,960)
Cash and cash equivalents, beginning of period	17,247,891	11,636,988
Cash and cash equivalents, end of period	$ 23,030,435	$ 8,708,028