RETIREMENT BENEFIT PLANS (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 25, 2015	Sep. 30, 2016	Sep. 25, 2015
Pension Benefits [Member]
Components of net periodic benefit cost [Abstract]
Interest cost	$ 15,000	$ 15,000	$ 44,000	$ 44,000
Expected return on plan assets	(16,000)	(16,000)	(48,000)	(49,000)
Amortization of net loss	10,000	13,000	30,000	37,000
Net periodic benefit cost	9,000	12,000	26,000	32,000
Entity's contributions towards pension plan			46,000
Expected future contributions in current fiscal year			15,000
Other Benefits [Member]
Components of net periodic benefit cost [Abstract]
Interest cost	13,000	12,000	38,000	37,000
Amortization of net loss	4,000	8,000	14,000	25,000
Net periodic benefit cost	$ 17,000	$ 20,000	$ 52,000	$ 62,000