RETIREMENT FUND AND PROFIT SHARING PLAN (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Class A Common Stock [Member]
Defined Contribution Plan Disclosure [Line Items]
Shares owned by plan (in shares)	27,962
Class B Common Stock [Member]
Defined Contribution Plan Disclosure [Line Items]
Shares owned by plan (in shares)	147,121
Retirement Fund [Member]
Defined Contribution Plan Disclosure [Line Items]
Compensation expense	$ 300	$ 300
Retirement Fund [Member] | Class A Common Stock [Member]
Defined Contribution Plan Disclosure [Line Items]
Shares owned by plan (in shares)	3,323
Retirement Fund [Member] | Class B Common Stock [Member]
Defined Contribution Plan Disclosure [Line Items]
Shares owned by plan (in shares)	17,342
401K Plan [Member]
Defined Contribution Plan Disclosure [Line Items]
Compensation expense	$ 100	100
SERP [Member]
Components of SERP expense [Abstract]
Service cost	175	148
Interest cost	168	165
Net amortization	94	98
Net periodic benefit cost	437	$ 411
Amounts recognized in accumulated other comprehensive loss, pretax [Abstract]
Prior service cost	1,113		$ 1,172
Net loss	2,935		2,970
Total amounts recognized in accumulated other comprehensive loss	$ 4,048		$ 4,142