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EMPLOYEE BENEFIT PLANS - Funded status of Retirement Income Plan (Details) - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
CHANGE IN PLAN ASSETS:      
Funded status at end of year $ 0 $ 0  
Retirement Income Plan      
EMPLOYEE BENEFIT PLANS      
ACCUMULATED BENEFIT OBLIGATION, END OF YEAR 5,576,000 6,433,000  
CHANGE IN PROJECTED BENEFIT OBLIGATION:      
Benefit obligation at beginning of year 6,433,000 5,833,000  
Service cost 0 0 $ 0
Interest cost 230,000 255,000 251,000
Actuarial loss 622,000 570,000  
Benefits paid (264,000) (225,000)  
Settlements (1,445,000) 0  
Projected benefit obligation at end of year 5,576,000 6,433,000 5,833,000
CHANGE IN PLAN ASSETS:      
Fair value of plan assets at beginning of year 7,314,000 6,802,000  
Actual return on plan assets 1,196,000 737,000  
Employer contributions 550,000 0 770,000
Benefits paid (264,000) (225,000)  
Settlements (1,445,000) 0  
Fair value of plan assets at end of year 7,351,000 7,314,000 $ 6,802,000
Funded status at end of year 1,775,000 881,000  
AMOUNTS RECOGNIZED IN THE CONSOLIDATED BALANCE SHEETS CONSIST OF:      
Noncurrent assets 1,775,000 881,000  
Current liabilities 0 0  
Noncurrent liabilities 0 0  
Amounts recognized in balance sheet 1,775,000 881,000  
AMOUNTS (PRE-TAX) RECOGNIZED IN ACCUMULATED OTHER COMPREHENSIVE LOSS CONSIST OF:      
Net loss 2,496,000 3,524,000  
Prior service cost (credit) 0 0  
Net transition obligation (asset) 0 0  
Amounts (pre-tax) recognized in accumulated other comprehensive loss $ 2,496,000 $ 3,524,000