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EMPLOYEE BENEFIT PLANS - Funded status of Retirement Income Plan (Details) - USD ($)
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
CHANGE IN PLAN ASSETS:      
Funded status at end of year $ 0 $ 0  
Retirement Income Plan      
EMPLOYEE BENEFIT PLANS      
ACCUMULATED BENEFIT OBLIGATION, END OF YEAR 6,433,000 5,833,000  
CHANGE IN PROJECTED BENEFIT OBLIGATION:      
Benefit obligation at beginning of year 5,833,000 6,379,000  
Service cost 0 0 $ 0
Interest cost 255,000 251,000 266,000
Actuarial loss 570,000 (554,000)  
Benefits paid (225,000) (243,000)  
Projected benefit obligation at end of year 6,433,000 5,833,000 6,379,000
CHANGE IN PLAN ASSETS:      
Fair value of plan assets at beginning of year 6,802,000 6,722,000  
Actual return on plan assets 737,000 (447,000)  
Employer contributions 0 770,000  
Benefits paid (225,000) (243,000)  
Fair value of plan assets at end of year 7,314,000 6,802,000 $ 6,722,000
Funded status at end of year 881,000 969,000  
AMOUNTS RECOGNIZED IN THE CONSOLIDATED BALANCE SHEETS CONSIST OF:      
Noncurrent assets 881,000 969,000  
Current liabilities 0 0  
Noncurrent liabilities 0 0  
Amounts recognized in balance sheet 881,000 969,000  
AMOUNTS (PRE-TAX) RECOGNIZED IN ACCUMULATED OTHER COMPREHENSIVE LOSS CONSIST OF:      
Net loss 3,524,000 3,311,000  
Prior service cost (credit) 0 0  
Net transition obligation (asset) 0 0  
Amounts (pre-tax) recognized in accumulated other comprehensive loss $ 3,524,000 $ 3,311,000