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Note 15 - Employee Benefit Plans (Tables)
12 Months Ended
Dec. 31, 2020
Notes Tables  
Schedule of Net Benefit Costs [Table Text Block]
   
Year ended December 31,
 
   
2020
   
2019
 
Service cost
  $
5
    $
4
 
Interest cost on projected benefit obligation
   
1,084
     
1,407
 
Net amortization of actuarial loss
   
631
     
666
 
Expected return on plan assets
   
(987
)    
(1,103
)
Net periodic benefit cost
  $
733
    $
974
 
Net Periodic Benefit Cost Recognized in Income Statement [Table Text Block]
   
Year ended December 31,
 
   
2020
   
2019
 
Service cost:
               
Selling, general and administrative expenses
  $
5
     
4
 
Other net periodic benefit costs:
               
Other expense (income), net
   
728
     
970
 
Total
  $
733
    $
974
 
Schedule of Changes in Projected Benefit Obligations [Table Text Block]
   
December 31,
 
   
2020
   
2019
 
Change in benefit obligation:
               
Benefit obligation at beginning of year
  $
36,050
    $
34,690
 
Service cost
   
5
     
4
 
Interest cost
   
1,084
     
1,407
 
Actuarial loss
   
2,516
     
2,835
 
Benefits paid
   
(2,796
)    
(2,886
)
Benefit obligation at end of year
  $
36,859
    $
36,050
 
   
December 31,
 
   
2020
   
2019
 
Change in plan assets:
               
Fair value of plan assets at beginning of year
  $
31,738
    $
30,199
 
Actual return on plan assets
   
2,549
     
4,043
 
Company contributions
   
862
     
382
 
Benefits paid
   
(2,796
)    
(2,886
)
Fair value of plan assets at end of year
  $
32,353
    $
31,738
 
                 
Underfunded status of the plans
  $
(4,506
)   $
(4,312
)
                 
Balance sheet assets (liabilities):
               
Other assets
  $
380
    $
607
 
Accrued liabilities
   
(596
)    
(893
)
Other liabilities
   
(4,290
)    
(4,026
)
Net amount recognized
  $
(4,506
)   $
(4,312
)
                 
Pension plans with accumulated benefit obligation in excess of plan assets:
               
Projected benefit obligation
  $
25,566
    $
24,843
 
Accumulated benefit obligation
   
25,566
     
24,843
 
Fair value of plan assets
   
20,680
     
19,924
 
   
December 31,
 
   
2020
 
2019
 
Projected benefit obligation and net periodic pension cost assumptions:
                 
Discount rate – projected benefit obligation
 
2.25%
 
3.15%
 
Discount rate – net periodic pension cost
 
3.15
 
4.25
 
Rate of compensation increase
 
N/A
 
4.00
 
Expected long-term rate of return on plan assets
 
3.05
3.40
 
3.65
3.90
 
                   
Weighted average asset allocation:
             
Equity securities
 
17%
 
18%
 
Debt securities
 
80
 
78
 
Other
 
3
 
4
 
Total
 
100%
 
100%
 
Schedule of Allocation of Plan Assets [Table Text Block]
   
 
 
 
 
Significant
 
   
Quoted Prices
   
Other
 
   
In Active
   
Observable
 
   
Markets
   
Inputs
 
   
(Level 1)
   
(Level 2)
 
Asset categories:
               
Cash and cash equivalents
  $
2,744
    $
0
 
Equity securities:
               
U.S. Large Cap
   
2,272
     
0
 
U.S. Mid Cap
   
867
     
0
 
U.S. Small Cap
   
224
     
0
 
World Equity
   
2,256
     
0
 
Real Estate
   
391
     
0
 
Other
   
600
     
0
 
Fixed income securities
   
6,304
     
16,695
 
Total Plan Assets
  $
15,658
    $
16,695
 
   
 
 
 
 
Significant
 
   
Quoted Prices
   
Other
 
   
In Active
   
Observable
 
   
Markets
   
Inputs
 
   
(Level 1)
   
(Level 2)
 
Asset categories:
               
Cash and cash equivalents
  $
2,228
    $
0
 
Equity securities:
               
U.S. Large Cap
   
1,935
     
0
 
U.S. Mid Cap
   
1,067
     
0
 
U.S. Small Cap
   
609
     
0
 
World Equity
   
2,214
     
0
 
Real Estate
   
546
     
0
 
Other
   
757
     
0
 
Fixed income securities
   
3,394
     
18,988
 
Total Plan Assets
  $
12,750
    $
18,988
 
Schedule of Expected Benefit Payments [Table Text Block]
2021
    $
2,772
 
2022
     
2,707
 
2023
     
2,631
 
2024
     
2,565
 
2025
     
2,490
 
2026-2030      
11,118
 
Total
    $
24,283