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Note 13 - Employee Retirement Plans (Tables)
12 Months Ended
Dec. 31, 2022
Notes Tables  
Schedule of Changes in Projected Benefit Obligations [Table Text Block]
  

December 31,

 
  

2022

  

2021

 

Change in projected benefit obligation:

        

Benefit obligation at beginning of year

 $6,261  $6,736 

Service cost

  115   137 

Interest cost

  153   137 

Participant contributions

  59   52 

Changes in actuarial assumptions

  (972)  (790)

Benefits paid

  (146)  (11)

Projected benefit obligation at end of year

 $5,470  $6,261 

Amounts recognized in the consolidated balance sheets consisted of:

        

Accrued expenses and other current liabilities

 $240  $230 

Retiree health benefit obligation

  5,230   6,031 
  $5,470  $6,261 
Schedule of Net Benefit Costs [Table Text Block]
  

2022

  

2021

  

2020

 

Components of net postretirement health benefit cost:

            

Service cost

 $115  $137  $147 

Interest cost

  153   137   191 

Amortization of net gain

  (400)  (312)  (310)

Net postretirement healthcare benefit cost

 $(132) $(38) $28 
Defined Benefit Plan, Assumptions [Table Text Block]
  

Year Ended December 31,

 
  

2022

  

2021

  

2020

 

Discount rate

  2.5%  2.1%  3.0%

Immediate healthcare cost trend rate

  *   **   *** 

Ultimate healthcare cost trend rate

  4.5   4.5   4.5 

Assumed annual reduction in trend rate

  *   **   *** 

Participation

  60   60   60