SHAREHOLDERS' EQUITY (Details) - USD ($)														12 Months Ended		136 Months Ended
	Dec. 13, 2019	Nov. 18, 2019	Sep. 10, 2019	Jun. 21, 2019	May 31, 2019	Mar. 22, 2019	Dec. 27, 2018	Sep. 26, 2018	Jun. 15, 2018	May 30, 2018	May 18, 2018	Mar. 28, 2018	Aug. 08, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	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	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 repurchased since inception														$ 305,000	$ 7,543,000
Treasury stock repurchased (in shares)														18,753	29,963
Treasury stock repurchased, average cost per share (USD per share)														$ 16.25	$ 20.02
Shares issued due to exercise of stock options (in shares)														1,667
Shares issued as compensation for the work (in shares)														14,568
Sale of Stock, Consideration Received on Transaction									$ 6,600,000		$ 16,000,000
Sale of Stock, Number of Shares Issued in Transaction									316,659
Sale of Stock, Price Per Share									$ 21.00
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance														$ 25,324,000	$ 40,241,000
Current-period change before reclassifications														(607,000)	(1,661,000)
Amounts reclassified from accumulated other comprehensive income (loss)														41,000	4,000
Income tax provision														(14,000)	10,000
Ending balance														27,275,000	25,324,000	$ 40,241,000
Dividends declared, price per share (USD per share)		$ 0.125			$ 0.125
Dividends paid, price per share (USD per share)							$ 0.125	$ 0.125		$ 0.125		$ 0.125
Dividends	$ 300,000		$ 300,000	$ 300,000		$ 300,000								1,200,000	3,100,000
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															18,600,000		$ 500,000.0	$ 500,000.0
Stock repurchased since inception																1,400,000
Foreign Currency Translation
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance														4,042,000	5,703,000
Current-period change before reclassifications														(607,000)	(1,661,000)
Amounts reclassified from accumulated other comprehensive income (loss)														0	0
Income tax provision														0	0
Ending balance														3,435,000	4,042,000	5,703,000
Pension Postretirement Benefit Obligation
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance														295,000	281,000
Current-period change before reclassifications														0	0
Amounts reclassified from accumulated other comprehensive income (loss)														41,000	4,000
Income tax provision														(14,000)	10,000
Ending balance														322,000	295,000	281,000
Accumulated other comprehensive income
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance														4,337,000	5,984,000
Ending balance														$ 3,757,000	$ 4,337,000	$ 5,984,000