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Note 8 - Employee Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2017
Notes Tables  
Schedule of Defined Benefit Plans Disclosures [Table Text Block]
   
December 31
,
  
   
201
7
    
201
6
    
201
5
  
Change in benefit obligatio
n
  
 
 
 
  
 
 
 
  
 
 
 
Projected benefit obligation at beginning of year
  
$
21,059
     $
20,427
     $
19,324
  
Service cost
  
 
692
      
694
      
620
  
Interest cost
  
 
743
      
757
      
669
  
Actuarial loss
  
 
1,417
      
198
      
798
  
Benefits paid
  
 
(419
)
    
(1,017
)
    
(984
)
Projected benefit obligation at end of year
  
$
23,492
     $
21,059
     $
20,427
  
                         
Change in plan asset
s
  
 
 
 
  
 
 
 
  
 
 
 
Fair value of plan assets at beginning of year
  
$
17,038
     $
16,131
     $
17,130
  
Actual return on plan assets
  
 
2,302
      
1,113
      
(155
)
Employer contribution
  
 
4,507
      
811
      
140
  
Benefits paid
  
 
(419
)
    
(1,017
)
    
(984
)
Fair value of plan assets at end of year
  
$
23,428
     $
17,038
     $
16,131
  
                         
Funded status at the end of the yea
r
  
$
(64
)
   $
(4,021
)
   $
(4,296
)
                         
Amounts recognized in the Consolidated Balance Shee
t
  
 
 
 
  
 
 
 
  
 
 
 
Deferred tax asset
  
$
13
     $
1,407
     $
1,504
  
Other liabilities
  
 
(64
)
    
(4,021
)
    
(4,296
)
Total amounts recognized in the Consolidated Balance Sheet
  
$
(51
)
   $
(2,614
)
   $
(2,792
)
                         
Amounts recognized in accumulated
other comprehensive (loss), ne
t
  
 
 
 
  
 
 
 
  
 
 
 
Net gain (loss)
  
$
(7,923
)
   $
(8,250
)
   $
(8,627
)
Prior service cost
  
 
340
      
449
      
559
  
Deferred tax asset
  
 
1,592
      
2,730
      
2,798
  
Amount
recognized
  
$
(5,991
)
   $
(5,071
)
   $
(5,270
)
                         
Accrued/Prepaid benefit cost, ne
t
  
 
 
 
  
 
 
 
  
 
 
 
Benefit obligation
  
$
(23,492
)
   $
(21,059
)
   $
(20,427
)
Fair value of assets
  
 
23,428
      
17,038
      
16,131
  
Unrecognized net actuarial loss
  
 
7,923
      
8,250
      
8,627
  
Unrecognized prior service cost
  
 
(340
)
    
(449
)
    
(559
)
Deferred tax liability
  
 
(1,579
)
    
(1,323
)
    
(1,294
)
Prepaid benefit cost included in other assets
  
$
5,940
     $
2,457
     $
2,478
  
                         
Components of net periodic benefit cos
t
  
 
 
 
  
 
 
 
  
 
 
 
Service cost
  
$
692
     $
694
     $
620
  
Interest
cost
  
 
743
      
757
      
669
  
Expected return on plan assets
  
 
(1,097
)
    
(1,110
)
    
(1,166
)
Amortization of prior service cost
  
 
(110
)
    
(110
)
    
(110
)
Recognized net actuarial loss
  
 
540
      
572
      
414
  
Net periodic benefit cost
  
$
768
     $
803
     $
427
  
                         
Other changes in plan assets and benefit obligations recognized in other comprehensive los
s
  
 
 
 
  
 
 
 
  
 
 
 
Net (gain) loss
  
$
(328
)
   $
(377
)
   $
1,705
  
Amortization of prior service cost
  
 
110
      
110
      
110
  
Deferred income tax expense (benefit)
  
 
46
      
93
      
(635
)
Total recognized
  
$
(172
)
   $
(174
)
   $
1,180
  
                         
Total recognized in net periodic benefit cost and other comprehensive loss
  
$
550
     $
536
     $
2,242
  
                         
Weighted average assumptions at end of the yea
r
  
 
 
 
  
 
 
 
  
 
 
 
Discount
rate used for net periodic pension cost
  
 
4.00
%
    
4.00
%
    
3.75
%
Discount rate used for disclosure
  
 
3.50
%
    
4.00
%
    
4.00
%
Expected return on plan assets
  
 
7.50
%
    
7.50
%
    
7.50
%
Rate of compensation increase
  
 
3.00
%
    
3.00
%
    
3.00
%
Schedule of Allocation of Plan Assets [Table Text Block]
   
Fair Value Measurements at
December 31, 20
1
7
  



Asset Category
  
Total
    
Quoted Prices in Active Markets for Identical Assets (Level 1)
    
Significant Observable Inputs (Level 2)
   
Significant Unobservable Inputs (Level 3)
  
Cash
  
$
4,454
    
$
4,454
    
$
---
    
$
---
  
Equity securities:
                                
U. S. companies
  
 
9,892
    
 
9,892
    
 
---
    
 
---
  
International companies
  
 
106
    
 
106
    
 
---
    
 
---
  
Equities mutual funds
(1)
  
 
1,962
    
 
1,962
    
 
---
    
 
---
  
U. S. government agencies and corporations
  
 
51
    
 
---
    
 
51
    
 
---
  
State and political subdivisions
  
 
231
    
 
---
    
 
231
    
 
---
  
Corporate bonds
– investment grade
(2)
  
 
6,732
    
 
---
    
 
6,732
    
 
---
  
Total pension plan assets
  
$
23,428
    
$
16,414
    
$
7,014
    
$
---
  
   
Fair Value Measurements at
December 31, 20
1
6
  



Asset Category
  
Total
    
Quoted Prices in Active Markets for Identical Assets (Level 1)
    
Significant Observable Inputs (Level 2)
   
Significant Unobservable Inputs (Level 3)
  
Cash
   $
207
     $
207
     $
---
     $
---
  
Equity securities:
                                
U. S. companies
    
9,195
      
9,195
      
---
      
---
  
International companies
    
116
      
116
      
---
      
---
  
Equities mutual funds
(1)
    
966
      
966
      
---
      
---
  
U. S. government agencies and corporations
    
53
      
---
      
53
      
---
  
State and political subdivisions
    
230
      
---
      
230
      
---
  
Corporate bonds
– investment grade
(2)
    
6,271
      
---
      
6,271
      
---
  
Total pension plan assets
   $
17,038
     $
10,484
     $
6,554
     $
---
  
Schedule of Expected Benefit Payments [Table Text Block]
201
8
 
 
  
$
4,229
  
201
9
 
 
  
$
1,060
  
2020
 
 
  
$
1,630
  
202
1
 
 
  
$
738
  
20
22
 
 
  
$
1,277
  
2023
-
2027
  
$
6,546