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Note 12 - Pension and Other Postretirement Benefit Plans (Tables)
12 Months Ended
Dec. 31, 2016
Notes Tables  
Schedule of Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block]
    Net Actuarial   Prior Service    
    loss (gain)   cost (credit)   Total
    2016   2015   2014   2016   2015   2014   2016   2015   2014
    (In thousands)
Employee Retirement Plan   $
8,055
    $
8,589
    $
9,938
    $
-
    $
-
    $
-
    $
8,055
    $
8,589
    $
9,938
 
Other Postretirement Benefit Plans    
636
     
1,296
     
2,130
     
(453
)    
(538
)    
(623
)    
183
     
758
     
1,507
 
Outside Directors Plan    
(540
)    
(562
)    
(488
)    
52
     
91
     
131
     
(488
)    
(471
)    
(357
)
Total   $
8,151
    $
9,323
    $
11,580
    $
(401
)   $
(447
)   $
(492
)   $
7,750
    $
8,876
    $
11,088
 
Schedule of Amounts in Accumulated Other Comprehensive Income (Loss) to be Recognized over Next Fiscal Year [Table Text Block]
    Net Actuarial   Prior Service    
    loss (gain)   cost (credit)   Total
    (In thousands)
Employee Retirement Plan   $
697
    $
-
    $
697
 
Other Postretirement Benefit Plans    
-
     
(85
)    
(85
)
Outside Directors Plan    
(92
)    
40
     
(52
)
Total   $
605
    $
(45
)   $
560
 
Schedule of Assumptions Used [Table Text Block]
    2016   2015
Discount rate    
3.88
%    
4.06
%
Rate of increase in health care costs                
Initial    
8.00
%    
7.00
%
Ultimate (year 2018)    
5.00
%    
5.00
%
Annual rate of salary increase for life insurance    
n/a
     
n/a
 
Schedule of Net Benefit Costs [Table Text Block]
    2016   2015   2014
    (In thousands)
Service cost   $
359
    $
382
    $
358
 
Interest cost    
320
     
300
     
253
 
Amortization of unrecognized loss    
47
     
119
     
-
 
Amortization of past service credit    
(85
)    
(85
)    
(85
)
Net postretirement benefit expense    
641
     
716
     
526
 
                         
Current year actuarial (gain) loss    
(613
)    
(715
)    
1,925
 
Amortization of actuarial loss    
(47
)    
(119
)    
-
 
Amortization of prior service credit    
85
     
85
     
85
 
Total recognized in other comprehensive income    
(575
)    
(749
)    
2,010
 
Total recognized in net postretirement expense and other comprehensive income   $
66
    $
(33
)   $
2,536
 
Schedule of Allocation of Plan Assets [Table Text Block]
    2016   2015
Equity securities    
69
%    
70
%
Debt securities    
31
%    
30
%
Schedule of Changes in Fair Value of Plan Assets [Table Text Block]
    At December 31,
    2016   2015
    (In thousands)
Pooled Separate Accounts                
U.S. large-cap growth (a)   $
4,702
    $
5,114
 
U.S. large-cap value (b)    
4,789
     
4,619
 
U.S. small-cap blend (c)    
2,362
     
2,094
 
International blend (d)    
2,017
     
2,079
 
Bond fund (e)    
5,950
     
5,671
 
Prudential short term (f)    
326
     
347
 
                 
Total   $
20,146
    $
19,924
 
Schedule of Effect of One-Percentage-Point Change in Assumed Health Care Cost Trend Rates [Table Text Block]
    Increase   Decrease
    (In thousands)
Effect on postretirement benefit obligation   $
1,614
    $
(1,230
)
Effect on total service and interest cost    
159
     
(118
)
Schedule of Employee Benefit Trust Shares [Table Text Block]
    2016   2015
         
Shares owned by Employee Benefit Trust, beginning balance    
675,436
     
800,950
 
Shares purchased    
18,391
     
22,102
 
Shares released and allocated    
(142,065
)    
(147,616
)
Shares owned by Employee Benefit Trust, ending balance    
551,762
     
675,436
 
                 
Market value of unallocated shares.   $
16,216,285
    $
14,616,435
 
Directors' Plan [Member]  
Notes Tables  
Schedule of Net Funded Status [Table Text Block]
   
2016
 
2015
 
 
(In thousands)
Change in benefit obligation:
 
 
 
 
 
 
 
 
Projected benefit obligation at beginning of year
 
$
2,530
 
 
$
2,663
 
Service cost
 
 
42
     
45
 
Interest cost    
97
     
95
 
Actuarial gain    
(63
)    
(129
)
Benefits paid    
(144
)    
(144
)
Projected benefit obligation at end of year    
2,462
     
2,530
 
                 
Change in plan assets:                
Market value of assets at beginning of year    
-
     
-
 
Employer contributions    
144
     
144
 
Benefits paid    
(144
)    
(144
)
Market value of plan assets at end of year    
-
     
-
 
                 
Accrued pension cost included in other liabilities   $
(2,462
)   $
(2,530
)
Schedule of Net Benefit Costs [Table Text Block]
    2016   2015   2014
    (In thousands)
Service cost   $
42
    $
45
    $
54
 
Interest cost    
97
     
95
     
116
 
Amortization of unrecognized gain    
(86
)    
(56
)    
(60
)
Amortization of past service liability    
40
     
40
     
40
 
Net pension expense    
93
     
124
     
150
 
                         
Current actuarial gain    
(63
)    
(130
)    
(52
)
Amortization of actuarial gain    
86
     
56
     
60
 
Amortization of prior service cost    
(40
)    
(40
)    
(40
)
Total recognized in other comprehensive income    
(17
)    
(114
)    
(32
)
Total recognized in net pension expense and other comprehensive income   $
76
    $
10
    $
118
 
Schedule of Expected Benefit Payments [Table Text Block]
For the years ending December 31:   Future Benefit
Payments
    (In thousands)
2017   $
288
 
2018    
272
 
2019    
288
 
2020    
288
 
2021    
288
 
2022 – 2026    
1,148
 
Assumptions Used to Determine Benefit Obligations and Periodic Pension Expense for the Directors' Plan [Member]  
Notes Tables  
Schedule of Assumptions Used [Table Text Block]
    2016   2015   2014
Weighted average discount rate for the benefit obligation    
3.88
%    
4.06
%    
3.76
%
Weighted average discount rate for periodic pension benefit expense    
4.06
%    
3.76
%    
4.60
%
Rate of increase in future compensation levels    
n/a
     
n/a
     
n/a
 
Postretirement Plans [Member]  
Notes Tables  
Schedule of Assumptions Used [Table Text Block]
    2016   2015   2014
Rate of return on plan assets    
n/a
     
n/a
     
n/a
 
Discount rate    
4.06
%    
3.76
%    
4.60
%
Rate of increase in health care costs                        
Initial    
7.00
%    
8.00
%    
9.00
%
Ultimate (year 2018)    
5.00
%    
5.00
%    
5.00
%
Annual rate of salary increase for life insurance    
n/a
     
n/a
     
n/a
 
Schedule of Expected Benefit Payments [Table Text Block]
For the years ending December 31:   Future Benefit
Payments
    (In thousands)
2017   $
215
 
2018    
248
 
2019    
268
 
2020    
265
 
2021    
274
 
2022 – 2026    
1,519
 
Domestic Postretirement Benefit Plan of Foreign Entity [Member]  
Notes Tables  
Schedule of Net Funded Status [Table Text Block]
    2016   2015
    (In thousands)
Change in benefit obligation:                
Projected benefit obligation at beginning of year   $
7,977
    $
8,073
 
Service cost    
359
     
382
 
Interest cost    
320
     
300
 
Actuarial gain    
(613
)    
(715
)
Benefits paid    
(65
)    
(63
)
Projected benefit obligation at end of year    
7,978
     
7,977
 
                 
Change in plan assets:                
Market value of assets at beginning of year    
-
     
-
 
Employer contributions    
65
     
63
 
Benefits paid    
(65
)    
(63
)
Market value of plan assets at end of year    
-
     
-
 
                 
Accrued pension cost included in other liabilities   $
(7,978
)   $
(7,977
)
Retirement Plan [Member]  
Notes Tables  
Schedule of Net Funded Status [Table Text Block]
    2016   2015
    (In thousands)
Change in benefit obligation:                
Projected benefit obligation at beginning of year   $
22,764
    $
24,097
 
Interest cost    
902
     
889
 
Actuarial (gain) loss    
130
     
(1,208
)
Benefits paid    
(1,027
)    
(1,014
)
Projected benefit obligation at end of year    
22,769
     
22,764
 
                 
Change in plan assets:                
Market value of assets at beginning of year    
19,924
     
20,509
 
Actual return on plan assets    
1,249
     
429
 
Benefits paid    
(1,027
)    
(1,014
)
Market value of plan assets at end of year    
20,146
     
19,924
 
                 
Accrued pension liability included in other liabilities   $
(2,623
)   $
(2,840
)
Schedule of Net Benefit Costs [Table Text Block]
    2016   2015   2014
    (In thousands)
Interest cost   $
902
    $
889
    $
891
 
Amortization of unrecognized loss    
809
     
1,112
     
759
 
Expected return on plan assets    
(1,394
)    
(1,400
)    
(1,344
)
Net pension expense    
317
     
601
     
306
 
                         
Current year actuarial (gain) loss    
275
     
(237
)    
4,798
 
Amortization of actuarial loss    
(809
)    
(1,112
)    
(759
)
Total recognized in other comprehensive income    
(534
)    
(1,349
)    
4,039
 
Total recognized in net pension cost (benefit) and other comprehensive income   $
(217
)   $
(748
)   $
4,345
 
Schedule of Expected Benefit Payments [Table Text Block]
For the years ending December 31:   Future Benefit
Payments
    (In thousands)
2017   $
1,190
 
2018    
1,183
 
2019    
1,197
 
2020    
1,197
 
2021    
1,239
 
2022 – 2026    
6,561
 
Assumptions for Periodic Pension Benefit for the Retirement Plan [Member]  
Notes Tables  
Schedule of Assumptions Used [Table Text Block]
    2016   2015   2014
Weighted average discount rate    
4.06
%    
3.76
%    
4.60
%
Rate of increase in future compensation levels    
n/a
     
n/a
     
n/a
 
Expected long-term rate of return on assets    
7.25
%    
7.50
%    
7.50
%
Assumptions for the Retirement Plan's Benefit Obligations [Member]  
Notes Tables  
Schedule of Assumptions Used [Table Text Block]
    2016   2015
Weighted average discount rate    
3.88
%    
4.06
%
Rate of increase in future compensation levels    
n/a
     
n/a