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RETIREMENT FUND AND PROFIT SHARING PLAN, SERP, Actuarial Assumptions (Details) - SERP [Member] | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Net periodic benefit cost [Abstract] |  |
Discount rate | 3.50% | 4.00%
Rate of compensation increase | 3.00% | 3.00%
Benefit obligation [Abstract] |  |
Discount rate | 4.00% | 3.50%
Rate of compensation increase | 2.50% | 3.00%

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- Definition Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(1) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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