SHAREHOLDERS' EQUITY (Details) - USD ($)										12 Months Ended		136 Months Ended
	Dec. 28, 2017	Nov. 17, 2017	Sep. 20, 2017	Aug. 14, 2017	Aug. 08, 2017	Jun. 02, 2017	Feb. 23, 2017	Dec. 21, 2016	Sep. 21, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2017	Aug. 31, 2016	Aug. 28, 2006	Jun. 30, 2004	May 19, 1998
Preferred Stock [Abstract]
Common stock, shares authorized (in shares)										99,000,000.0	99,000,000	99,000,000.0				100,000,000.0
Preferred stock, shares authorized (in shares)										1,000,000.0	1,000,000	1,000,000.0
Preferred stock, par value (in dollars per share)										$ 0.01	$ 0.01	$ 0.01
Preferred stock, shares issued (in shares)										0	0	0
Preferred stock, shares outstanding (in shares)										0	0	0
Equity, Class of Treasury Stock [Line Items]
Treasury stock repurchased (in shares)										15,418	15,697
Treasury stock repurchased, average cost per share (USD per share)										$ 14.69	$ 17.28
Shares issued due to exercise of stock options (in shares)										15,000
Shares issued as compensation for the work (in shares)										12,068
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance										$ 38,885,000	$ 38,564,000
Current-period change before reclassifications										4,169,000
Amounts reclassified from accumulated other comprehensive income										(29,000)
Income tax benefit										10,000
Ending balance										40,241,000	38,885,000	$ 40,241,000
Dividends declared, price per share (USD per share)		$ 0.125		$ 0.125		$ 0.125	$ 0.125
Dividends paid, price per share (USD per share)	$ 0.125		$ 0.125					$ 0.125	$ 0.125
Dividends										1,400,000	700,000
June 2004 Plan
Equity, Class of Treasury Stock [Line Items]
Number of common shares authorized to be repurchased (in shares)					19,084										131,756
Stock repurchase program, authorized amount															$ 1,300,000.0
Stock repurchased during period, shares					112,672
August 2006 Plan
Equity, Class of Treasury Stock [Line Items]
Stock repurchase program, authorized amount														$ 20,000,000
Stock repurchase program, remaining authorized repurchase amount										19,500,000		19,500,000	$ 500,000.0
Stock repurchased since inception												500,000
Foreign Currency Translation
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance										1,534,000
Current-period change before reclassifications										4,169,000
Amounts reclassified from accumulated other comprehensive income										0
Income tax benefit										0
Ending balance										5,703,000	1,534,000	5,703,000
Pension Postretirement Benefit Obligation
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance										300,000
Current-period change before reclassifications										0
Amounts reclassified from accumulated other comprehensive income										(29,000)
Income tax benefit										10,000
Ending balance										281,000	300,000	281,000
Accumulated other comprehensive income
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance										1,834,000	686,000
Ending balance										$ 5,984,000	$ 1,834,000	$ 5,984,000