RETIREMENT BENEFIT PLANS, Funded Status (Details) - USD ($)	12 Months Ended
Dec. 30, 2017	Dec. 31, 2016	Jan. 02, 2016
Funded status [Abstract]
Net amount recognized in the balance sheet	$ 26,423,429	$ 26,631,438
Pension Benefits [Member]
Change in benefit obligation [Roll Forward]
Benefit obligation at beginning of year	92,258,937	87,427,769
Change due to availability of final actual assets and census data	0	0
Discount rate	6,200,491	2,359,745
Service cost	1,276,608	1,977,295	$ 3,770,191
Interest cost	3,170,194	3,486,982	3,472,870
Actuarial (gain)/loss	(1,495,135)	2,940,154
Benefits paid	(3,385,793)	(3,398,419)
Additional recognition due to plan amendment	496,899	(2,534,589)
Benefit obligation at end of year	98,522,201	92,258,937	87,427,769
Change in fair value of plan assets [Roll Forward]
Fair value of plan assets at beginning of year	65,627,499	63,122,843
Actual return on plan assets	9,315,225	4,653,349
Employer contributions	541,841	1,249,726
Benefits paid	(3,385,793)	(3,398,419)
Fair value of plan assets at end of year	72,098,772	65,627,499	63,122,843
Funded status [Abstract]
Net amount recognized in the balance sheet	(26,423,429)	(26,631,438)
Other Postretirement Benefits [Member]
Change in benefit obligation [Roll Forward]
Benefit obligation at beginning of year	2,339,050	1,981,344
Change due to availability of final actual assets and census data	0	317,440
Discount rate	181,691	34,471
Service cost	27,389	29,300	217,570
Interest cost	80,827	94,872	154,915
Actuarial (gain)/loss	(65,601)	33,022
Benefits paid	(139,946)	(151,399)
Additional recognition due to plan amendment	0	0
Benefit obligation at end of year	2,423,410	2,339,050	1,981,344
Change in fair value of plan assets [Roll Forward]
Fair value of plan assets at beginning of year	1,287,350	1,188,289
Actual return on plan assets	103,889	99,061
Employer contributions	139,946	151,399
Benefits paid	(139,946)	(151,399)
Fair value of plan assets at end of year	1,391,239	1,287,350	$ 1,188,289
Funded status [Abstract]
Net amount recognized in the balance sheet	$ (1,032,171)	$ (1,051,700)

The amount of increase or decrease due to a change in the terms of discount rate.

No definition available.

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- Definition

Amount of increase (decrease) in plan assets of defined benefit plan from actual return (loss) determined by change in fair value of plan assets adjusted for contributions, benefit payments, and other expenses.

+ References

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- Definition

Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive plan.

+ References

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- Definition

Amount of asset (liability), recognized in statement of financial position, for defined benefit pension and other postretirement plans.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64852052&loc=d3e1703-114919

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

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No definition available.

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- Definition

Amount of actuarial present value of benefits attributed to service rendered by employee for defined benefit plan.

+ References

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- Definition

Amount of payment to participant of defined benefit plan which decreases benefit obligation. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 60
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39716-114964

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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No definition available.

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- Definition

Amount of contribution received by defined benefit plan from employer which increases plan assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
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-Subparagraph (d)(5)(ii)
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- Definition

Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees.

+ References

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- Definition

Amount of cost recognized for passage of time related to defined benefit plan.

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- Definition

Amount of increase (decrease) in benefit obligation of defined benefit plan from change, classified as other.

+ References

No definition available.

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- Definition

Amount of increase (decrease) in benefit obligation of defined benefit plan from change in terms of existing plan or initiation of new plan.

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Amount of payment to participant under defined benefit plan which decreases plan assets. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 60
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Amount of cost for actuarial present value of benefits attributed to service rendered by employee for defined benefit plan.

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