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Note 12 - Pension and Other Postretirement Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2018
Notes Tables  
Schedule of Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block]
    Net Actuarial
Loss (Gain)		     Prior Service
Cost (Credit)		     Total  
    2018     2017     2016     2018     2017     2016     2018     2017     2016  
    (In thousands)  
Employee Retirement Plan   $
3,238
     $
6,166
     $
8,055
     $
-
     $
-
     $
-
     $
3,238
     $
6,166
     $
8,055
  
Other Postretirement Benefit Plans    
35
      
1,223
      
636
      
(283
 )    
(368
 )    
(453
 )    
(248
 )    
855
      
183
  
Outside Directors Plan    
(566
 )    
(472
 )    
(540
 )    
-
      
12
      
52
      
(566
 )    
(460
 )    
(488
 )
Total   $
2,707
     $
6,917
     $
8,151
     $
(283
 )   $
(356
 )   $
(401
 )   $
2,424
     $
6,561
     $
7,750
  
Schedule of Amounts in Accumulated Other Comprehensive Income (Loss) to be Recognized over Next Fiscal Year [Table Text Block]
    Net Actuarial
Loss (Gain)		   Prior Service
Cost (Credit)		   Expense
(Benefit)
    (In thousands)
Employee Retirement Plan   $
269
     $
-
     $
269
  
Other Postretirement Benefit Plans    
-
      
(85
 )    
(85
 )
Outside Directors Plan    
(141
 )    
-
      
(141
 )
Total   $
128
     $
(85
 )   $
43
  
Schedule of Net Funded Status [Table Text Block]
    2018   2017
    (In thousands)
Change in benefit obligation:                
Projected benefit obligation at beginning of year   $
23,605
     $
22,769
  
Interest cost    
781
      
864
  
Actuarial loss    
(2,389
 )    
962
  
Benefits paid    
(1,653
 )    
(990
 )
Projected benefit obligation at end of year    
20,344
      
23,605
  
                 
Change in plan assets:                
Market value of assets at beginning of year    
22,702
      
20,146
  
Actual return on plan assets    
1,370
      
3,546
  
Benefits paid    
(1,653
 )    
(990
 )
Market value of plan assets at end of year    
22,419
      
22,702
  
                 
Accrued pension asset/liability included in other assets (liabilities)   $
2,075
     $
(903
 )
    2018   2017
    (In thousands)
Change in benefit obligation:                
Projected benefit obligation at beginning of year   $
9,104
     $
7,978
  
Service cost    
350
      
316
  
Interest cost    
307
      
305
  
Actuarial (gain) loss    
(1,155
 )    
588
  
Benefits paid    
(88
 )    
(83
 )
Projected benefit obligation at end of year    
8,518
      
9,104
  
                 
Change in plan assets:                
Market value of assets at beginning of year    
-
      
-
  
Employer contributions    
88
      
83
  
Benefits paid    
(88
 )    
(83
 )
Market value of plan assets at end of year    
-
      
-
  
                 
Accrued pension cost included in other liabilities   $
(8,518
 )   $
(9,104
 )
    2018   2017
   
(In thousands)
Change in benefit obligation:                
Projected benefit obligation at beginning of year   $
2,425
     $
2,462
  
Service cost    
42
      
42
  
Interest cost    
78
      
89
  
Actuarial gain    
(184
 )    
(24
 )
Benefits paid    
(96
 )    
(144
 )
Projected benefit obligation at end of year    
2,265
      
2,425
  
                 
Change in plan assets:                
Market value of assets at beginning of year    
-
      
-
  
Employer contributions    
96
      
144
  
Benefits paid    
(96
 )    
(144
 )
Market value of plan assets at end of year    
-
      
-
  
                 
Accrued pension cost included in other liabilities   $
(2,265
 )   $
(2,425
 )
Schedule of Assumptions Used [Table Text Block]
    2018   2017
Weighted average discount rate  
4.06%
  
3.42%
Rate of increase in future compensation levels  
n/a
  
n/a
    2018   2017   2016
Weighted average discount rate  
3.42%
  
3.88%
  
4.06%
Rate of increase in future compensation levels  
n/a
  
n/a
  
n/a
Expected long-term rate of return on assets  
7.00%
  
7.00%
  
7.25%
    2018   2017
Discount rate  
4.06%
  
3.42%
Rate of increase in health care costs        
Initial  
7.00%
  
7.00%
Ultimate (year 2023)  
5.00%
  
5.00%
Annual rate of salary increase for life insurance  
n/a
  
n/a
    2018   2017   2016
Rate of return on plan assets  
n/a
  
n/a
  
n/a
Discount rate  
3.42%
  
3.88%
  
4.06%
Rate of increase in health care costs            
Initial  
7.00%
  
8.00%
  
7.00%
Ultimate (year 2023)  
5.00%
  
5.00%
  
5.00%
Annual rate of salary increase for life insurance  
n/a
  
n/a
  
n/a
    2018   2017   2016
Weighted average discount rate for the benefit obligation  
4.06%
  
3.42%
  
3.88%
Weighted average discount rate for periodic pension benefit expense  
3.42%
  
3.88%
  
4.06%
Rate of increase in future compensation levels  
n/a
  
n/a
  
n/a
Schedule of Net Benefit Costs [Table Text Block]
    2018   2017   2016
    (In thousands)
Interest cost   $
781
     $
864
     $
902
  
Amortization of unrecognized loss    
621
      
697
      
809
  
Expected return on plan assets    
(1,452
 )    
(1,392
 )    
(1,394
 )
Net pension (benefit) expense    
(50
 )    
169
      
317
  
                         
Current year actuarial (gain) loss    
(2,307
 )    
(1,192
 )    
275
  
Amortization of actuarial loss    
(621
 )    
(697
 )    
(809
 )
Total recognized in other comprehensive income    
(2,928
 )    
(1,889
 )    
(534
 )
Total recognized in net pension cost (benefit) and other comprehensive loss   $
(2,978
 )   $
(1,720
 )   $
(217
 )
    2018   2017   2016
    (In thousands)
Service cost   $
350
     $
316
     $
359
  
Interest cost    
307
      
305
      
320
  
Amortization of unrecognized loss    
33
      
-
      
47
  
Amortization of past service credit    
(85
 )    
(85
 )    
(85
 )
Net postretirement benefit expense    
605
      
536
      
641
  
                         
Current year actuarial (gain) loss    
(1,155
 )    
587
      
(613
 )
Amortization of actuarial loss    
(33
 )    
-
      
(47
 )
Amortization of prior service credit    
85
      
85
      
85
  
Total recognized in other comprehensive income    
(1,103
 )    
672
      
(575
 )
Total recognized in net postretirement expense and other comprehensive loss   $
(498
 )   $
1,208
     $
66
  
    2018   2017   2016
    (In thousands)
Service cost   $
42
     $
42
     $
42
  
Interest cost    
78
      
89
      
97
  
Amortization of unrecognized gain    
(91
 )    
(92
 )    
(86
 )
Amortization of past service liability    
12
      
40
      
40
  
Net pension expense    
41
      
79
      
93
  
                         
Current actuarial gain    
(184
 )    
(24
 )    
(63
 )
Amortization of actuarial gain    
91
      
92
      
86
  
Amortization of prior service cost    
(12
 )    
(40
 )    
(40
 )
Total recognized in other comprehensive income    
(105
 )    
28
      
(17
 )
                         
Total recognized in net pension expense and other comprehensive income   $
(64
 )   $
107
     $
76
  
Schedule of Expected Benefit Payments [Table Text Block]
    Future Benefit Payments
    (In thousands)
2019   $
1,300
  
2020    
1,133
  
2021    
1,177
  
2022    
1,205
  
2023    
1,228
  
2024 – 2028    
6,033
  
    Future Benefit Payments
    (In thousands)
2019   $
260
  
2020    
266
  
2021    
286
  
2022    
319
  
2023    
326
  
2024 – 2028    
1,755
  
    Future Benefit Payments
    (In thousands)
2019   $
288
  
2020    
288
  
2021    
288
  
2022    
288
  
2023    
256
  
2024 – 2028    
988
  
Schedule of Allocation of Plan Assets [Table Text Block]
    2018   2017
Equity securities    
0
 %    
72
 %
Debt securities    
100
 %    
28
 %
Schedule of Changes in Fair Value of Plan Assets [Table Text Block]
    At December 31,
    2018   2017
    (In thousands)
Pooled Separate Accounts                
Long duration bond fund (a)   $
10,045
     $
-
  
Long corporate bond fund (b)    
4,471
      
-
  
Prudential short term (c)    
360
      
77
  
U.S. large-cap growth (d)    
-
      
5,822
  
U.S. large-cap value (e)    
-
      
5,164
  
U.S. small-cap blend (f)    
-
      
2,735
  
International blend (g)    
-
      
2,566
  
Bond fund (h)    
-
      
6,338
  
Mutual Fund                
Investment grade bond fund (i)    
7,543
      
-
  
                 
Total   $
22,419
     $
22,702
  
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   $
1,652
     $
(1,277
 )
Effect on total service and interest cost    
147
      
(111
 )
Schedule of Employee Benefit Trust Shares [Table Text Block]
    2018   2017
         
Shares owned by Employee Benefit Trust, beginning balance    
445,022
      
551,762
  
Shares purchased    
13,669
      
11,631
  
Shares released and allocated    
(129,601
 )    
(118,371
 )
Shares owned by Employee Benefit Trust, ending balance    
329,090
      
445,022
  
                 
Market value of unallocated shares   $
7,085,308
     $
12,238,105