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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) |

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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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of actuarial present value of benefits attributed to service rendered by employee for defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(6) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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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 -Paragraph 1 -Subparagraph (d)(5)(ii) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2709-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(5)(iv)(01) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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