SHAREHOLDERS' EQUITY (Details) - USD ($)																12 Months Ended
	Dec. 30, 2020	Nov. 20, 2020	Sep. 29, 2020	Aug. 28, 2020	Jun. 25, 2020	Jun. 24, 2020	May 29, 2020	May 27, 2020	Mar. 13, 2020	Feb. 14, 2020	Dec. 27, 2018	Sep. 26, 2018	May 30, 2018	Mar. 28, 2018	Aug. 08, 2017	Dec. 31, 2020	Dec. 31, 2019	Aug. 31, 2018	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					100,000,000.0
Preferred stock, shares authorized (in shares)																1,000,000.0	1,000,000
Preferred stock, par value (in dollars per share)																$ 0.01	$ 0.01
Preferred stock, shares issued (in shares)																0	0
Preferred stock, shares outstanding (in shares)																0	0
Equity, Class of Treasury Stock [Line Items]
Stock repurchase program, authorized amount																				$ 20,000,000
Stock repurchased since inception																$ 6,256,000	$ 305,000
Treasury stock repurchased (in shares)																351,581	18,753
Treasury stock repurchased, average cost per share (USD per share)																$ 17.79	$ 16.25
Shares issued due to exercise of stock options (in shares)																28,157
Shares issued as compensation for the work (in shares)																13,374
Sale of Stock, Consideration Received on Transaction							$ 5,000,000.0
Sale of Stock, Number of Shares Issued in Transaction					294,117
Sale of Stock, Price Per Share					$ 17.00
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance																$ 27,275,000	$ 25,324,000
Current-period change before reclassifications																1,358,000	(607,000)
Amounts reclassified from accumulated other comprehensive income (loss)																54,000	41,000
Income tax provision																(19,000)	(14,000)
Ending balance																25,972,000	27,275,000
Dividends declared, price per share (USD per share)		$ 1,160,000		$ 160,000				$ 0.125		$ 0.125
Dividends paid, price per share (USD per share)											$ 0.125	$ 0.125	$ 0.125	$ 0.125
Dividends	$ 2,400,000		$ 300,000			$ 300,000			$ 300,000							3,300,000	1,200,000
Class of Treasury Stock [Table]
Payments for Repurchase of Common Stock					$ 5,000,000.0											5,933,000	294,000
June 2004 Plan
Equity, Class of Treasury Stock [Line Items]
Number of common shares authorized to be repurchased (in shares)																					131,756
Stock repurchase program, authorized amount																					$ 1,300,000
Stock repurchase program, remaining authorized repurchase amount															$ 19,084
Stock repurchased during period, shares															112,672
August 2006 Plan
Equity, Class of Treasury Stock [Line Items]
Stock repurchase program, remaining authorized repurchase amount																12,600,000		$ 500,000	$ 500,000
Stock repurchased since inception																1,500,000
Foreign Currency Translation
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance																3,435,000	4,042,000
Current-period change before reclassifications																1,358,000	(607,000)
Amounts reclassified from accumulated other comprehensive income (loss)																0	0
Income tax provision																0	0
Ending balance																4,793,000	3,435,000
Pension Postretirement Benefit Obligation
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance																322,000	295,000
Current-period change before reclassifications																0	0
Amounts reclassified from accumulated other comprehensive income (loss)																54,000	41,000
Income tax provision																(19,000)	(14,000)
Ending balance																357,000	322,000
Accumulated other comprehensive income
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance																3,757,000	4,337,000
Ending balance																$ 5,150,000	$ 3,757,000