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EMPLOYEE BENEFIT PLANS - Funded status of Retirement Income Plan (Details) - USD ($)
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
CHANGE IN PLAN ASSETS:      
Funded status at end of year $ 0 $ 0  
Retirement Income Plan      
EMPLOYEE BENEFIT PLANS      
ACCUMULATED BENEFIT OBLIGATION, END OF YEAR 5,832,000 5,576,000  
CHANGE IN PROJECTED BENEFIT OBLIGATION:      
Benefit obligation at beginning of year 5,576,000 6,433,000  
Service cost 0 0 $ 0
Interest cost 147,000 230,000 255,000
Actuarial loss 347,000 622,000  
Benefits paid (238,000) (264,000)  
Settlement 0 (1,445,000)  
Projected benefit obligation at end of year 5,832,000 5,576,000 6,433,000
CHANGE IN PLAN ASSETS:      
Fair value of plan assets at beginning of year 7,351,000 7,314,000  
Actual return on plan assets (243,000) 1,196,000  
Employer contributions 0 550,000  
Benefits paid (238,000) (264,000)  
Settlement 0 (1,445,000)  
Fair value of plan assets at end of year 6,870,000 7,351,000 $ 7,314,000
Funded status at end of year 1,038,000 1,775,000  
AMOUNTS RECOGNIZED IN THE CONSOLIDATED BALANCE SHEETS CONSIST OF:      
Noncurrent assets 1,038,000 1,775,000  
Current liabilities 0 0  
Noncurrent liabilities 0 0  
Amounts recognized in balance sheet 1,038,000 1,775,000  
AMOUNTS (PRE-TAX) RECOGNIZED IN ACCUMULATED OTHER COMPREHENSIVE LOSS CONSIST OF:      
Net loss 3,303,000 2,496,000  
Prior service cost (credit) 0 0  
Net transition obligation (asset) 0 0  
Amounts (pre-tax) recognized in accumulated other comprehensive loss $ 3,303,000 $ 2,496,000