Retirement Benefit Plans (Details) - USD ($)	3 Months Ended	9 Months Ended
Oct. 03, 2015	Sep. 27, 2014	Oct. 03, 2015	Sep. 27, 2014
Significant disclosures relating to benefit plans [Abstract]
Percentage of voluntary contributions allowed to participants, maximum			100.00%
Contributions made by the Company under Section 401(k)	$ 49,207	$ 49,975	$ 157,133	$ 153,431
Pension Benefits [Member]
Significant disclosures relating to benefit plans [Abstract]
Service cost	964,985	698,423	2,894,960	2,095,271
Interest cost	859,239	829,278	2,577,715	2,487,835
Expected return on plan assets	(1,287,914)	(1,202,632)	(3,863,742)	(3,607,894)
Amortization of prior service cost	54,647	54,647	163,940	163,940
Amortization of the net loss	472,726	236,033	1,418,182	708,098
Net periodic benefit cost	1,063,683	615,749	3,191,055	1,847,250
Contributions required by the Company in defined benefit plan			3,000,000
Contributions made by Company			1,900,000
Postretirement Benefits [Member]
Significant disclosures relating to benefit plans [Abstract]
Service cost	54,393	43,476	163,178	130,427
Interest cost	38,728	39,371	116,186	118,112
Expected return on plan assets	(22,984)	(23,703)	(68,952)	(71,109)
Amortization of prior service cost	(5,972)	(5,972)	(17,916)	(17,917)
Amortization of the net loss	4,701	0	14,103	0
Net periodic benefit cost	$ 68,866	$ 53,172	206,599	$ 159,513
Contributions required by the Company in defined benefit plan			150,000
Contributions made by Company			$ 90,000

The amount of gains or losses recognized in net periodic benefit cost.

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- Definition

The amount of the prior service cost or credit recognized in net periodic benefit cost relating to benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

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-Publisher FASB

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-Glossary Prior Service Cost

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- Definition

The increase in the fair value of plan assets from contributions made by the employer.

+ References

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- Definition

An amount calculated as a basis for determining the extent of delayed recognition of the effects of changes in the fair value of assets. The expected return on plan assets is determined based on the expected long-term rate of return on plan assets and the market-related value of plan assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Expected Return on Plan Assets

-URI http://asc.fasb.org/extlink&oid=6512171

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- Definition

The increase in a defined benefit pension plan's projected benefit obligation or a defined benefit postretirement plan's accumulated postretirement benefit obligation due to the passage of time.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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- Definition

The total amount of net periodic benefit cost for defined benefit plans for the period. Periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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- References

No definition available.

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- Definition

The actuarial present value of benefits attributed by the pension benefit formula to services rendered by employees during the period. The portion of the expected postretirement benefit obligation attributed to employee service during the period. The service cost component is a portion of the benefit obligation and is unaffected by the funded status of the plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Service Cost (Component of Net Periodic Pension Cost)

-URI http://asc.fasb.org/extlink&oid=6525008

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- Definition

Amount of employer's best estimate of contributions expected to be paid to the plan in the current remaining fiscal period.

+ References

No definition available.

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- Definition

Amount of discretionary contributions made by an employer to a defined contribution plan.

+ References

No definition available.

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- Definition

Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan.

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No definition available.

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