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Note 10 - Retirement Plans (Tables)
12 Months Ended
Mar. 31, 2020
Notes Tables  
Schedule of Changes in Projected Benefit Obligations [Table Text Block]
   
2020
   
2019
 
   
                (In thousands)
 
Change in Benefit Obligation
 
 
 
 
 
 
 
 
                 
Benefit obligation at beginning of year
  $
250,461
    $
236,134
 
Service cost
   
9,244
     
8,954
 
Interest cost
   
9,064
     
9,131
 
Liability gain due to curtailment
   
(1,114
)    
-
 
Actuarial loss
   
20,146
     
4,113
 
Benefit payments and expenses
   
(9,574
)    
(7,871
)
Benefit obligation at end of year
  $
278,227
    $
250,461
 
                 
Change in Plan Assets
 
 
 
 
 
 
 
 
                 
Fair value of plan assets at beginning of year
  $
233,112
    $
212,844
 
Actual (loss) gain on plan assets
   
(46,325
)    
26,731
 
Employer contributions
   
26,000
     
2,100
 
Benefit payments and expenses
   
(10,302
)    
(8,563
)
Fair value of plan assets at end of year
  $
202,485
    $
233,112
 
                 
Unfunded Status
  $
(75,742
)   $
(17,349
)
Schedule of Amounts in Accumulated Other Comprehensive Income (Loss) to be Recognized over Next Fiscal Year [Table Text Block]
   
2020
   
2019
 
   
                      (In thousands)
 
Amounts Recognized in Accumulated Other Comprehensive Pre-Tax Loss
 
 
 
 
 
 
 
 
                 
Prior service cost
  $
(349
)   $
(587
)
Net loss
   
(105,866
)    
(24,305
)
Accumulated other comprehensive pre-tax loss
  $
(106,215
)   $
(24,892
)
Schedule of Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block]
   
Pension and
 
   
post retirement plan
 
   
adjustments, net
 
   
of tax
 
   
(In thousands)
 
Accumulated Other Comprehensive Loss
 
 
 
 
         
Balance at March 31, 2019
  $
(18,285
)
Other comprehensive loss
   
(60,935
)
Balance at March 31, 2020
  $
(79,220
)
Schedule of Defined Benefit Plans Disclosures [Table Text Block]
   
2020
   
2019
 
   
                                 (In thousands)
 
Service cost including administration
  $
9,935
    $
9,646
 
Interest cost
   
9,064
     
9,131
 
Expected return on plan assets
   
(16,746
)    
(15,104
)
Amortization of net loss
   
579
     
1,597
 
Prior service cost
   
120
     
119
 
Net periodic benefit cost
  $
2,952
    $
5,389
 
Settlement/curtailment expense
   
118
     
-
 
Net periodic benefit cost with curtailment
  $
3,070
    $
5,389
 
Defined Benefit Plan, Assumptions [Table Text Block]
   
2020
   
2019
 
                 
Weighted Average Assumptions for Balance Sheet Liability at End of Year:
 
 
 
 
 
 
 
 
                 
Discount rate - projected benefit obligation
   
3.69
%    
4.14
%
Expected return on plan assets
   
7.25
%    
7.25
%
Rate of compensation increase
   
3.00
%    
3.00
%
                 
Weighted Average Assumptions for Benefit Cost at Beginning of Year:
 
 
 
 
 
 
 
 
                 
Discount rate - benefit obligations
   
4.14
%    
4.15
%
Discount rate - interest cost
   
3.74
%    
3.87
%
Discount rate - service cost
   
4.34
%    
4.25
%
Discount rate - interest on service cost
   
3.69
%    
4.14
%
Expected return on plan assets
   
7.25
%    
7.25
%
Rate of compensation increase
   
3.00
%    
3.00
%
Schedule of Allocation of Plan Assets [Table Text Block]
   
Target
   
Percentage of Plan
   
Allocation
   
Assets at March 31,
 
   
2021
   
2020
   
2019
 
                         
Plan Assets
 
 
 
 
 
 
 
 
 
 
 
 
                         
Equity securities
   
99
%    
97
%    
99
%
Debt securities
   
-
     
-
     
-
 
Real estate
   
-
     
-
     
-
 
Cash
   
1
%    
3
%    
1
%
Total
   
100
%    
100
%    
100
%
   
2020
   
2019
 
   
Market Value
   
Market Value
 
   
(In thousands)
 
Assets by Industry Type
 
 
 
 
 
 
 
 
                 
Asset Category
 
 
 
 
 
 
 
 
Cash and cash equivalents:
               
Money market funds
  $
7,058
    $
1,387
 
Total cash and cash equivalents
   
7,058
     
1,387
 
Common equity securities:
 
 
 
 
 
 
 
 
Materials
   
8,772
     
5,331
 
Industrials
   
15,440
     
16,080
 
Telecommunication services
   
25,093
     
24,370
 
Consumer staples
   
42,522
     
43,486
 
Energy
   
28,538
     
38,230
 
Financials
   
22,275
     
34,521
 
Health care
   
-
     
4,247
 
Information technology
   
20,657
     
28,750
 
Utilities
   
32,130
     
36,710
 
Total common equity securities
   
195,427
     
231,725
 
Total assets
  $
202,485
    $
233,112
 
Schedule of Expected Contributions [Table Text Block]
Expected Employer Contributions   $
-
 
Expected Employee Contributions    
-
 
Schedule of Expected Benefit Payments [Table Text Block]
2021
    $
10,102
 
2022
     
10,785
 
2023
     
11,490
 
2024
     
12,259
 
2025
     
13,022
 
2026-2030      
75,047