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Note 8 - Employee Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2016
Notes Tables  
Schedule of Defined Benefit Plans Disclosures [Table Text Block]
   
Dec
ember 31,
  
   
20
16
    
20
15
    
20
14
  
Change in benefit obligation
  
 
 
 
  
 
 
 
  
 
 
 
Projected benefit obligation at beginning of year
  
$
20,427
     $
19,324
     $
17,185
  
Service cost
  
 
694
      
620
      
524
  
Interest cost
  
 
757
      
669
      
663
  
Actuarial
loss
  
 
198
      
798
      
1,674
  
Benefits paid
  
 
(1,017
)
    
(984
)
    
(722
)
Projected benefit obligation at end of year
  
$
21,059
     $
20,427
     $
19,324
  
                         
Change in plan assets
  
 
 
 
  
 
 
 
  
 
 
 
Fair value of plan assets at beginning of year
  
$
16,131
     $
17,130
     $
16,605
  
Actual return on plan assets
  
 
1,113
      
(155
)
    
884
  
Employer contribution
  
 
811
      
140
      
363
  
Benefits paid
  
 
(1,017
)
    
(984
)
    
(722
)
Fair value of plan assets at end of year
  
$
17,038
     $
16,131
     $
17,130
  
                         
Funded status at the end of the year
  
$
(4,021
)
   $
(4,296
)
   $
(2,194
)
                         
Amounts recognized in the
Consolidated Balance Sheet
  
 
 
 
  
 
 
 
  
 
 
 
Deferred tax asset
  
$
1,407
     $
1,504
     $
768
  
Other liabilities
  
 
(4,021
)
    
(4,296
)
    
(2,194
)
Total amounts recognized in the Consolidated Balance Sheet
  
$
(2,614
)
   $
(2,792
)
   $
(1,426
)
                         
Amounts recognized in acc
umulated other comprehensive (loss), net
  
 
 
 
  
 
 
 
  
 
 
 
Net loss
  
$
(8,250
)
   $
(8,627
)
   $
(6,922
)
Prior service cost
  
 
449
      
559
      
669
  
Deferred tax asset
  
 
2,730
      
2,798
      
2,163
  
Amount recognized
  
$
(5,071
)
   $
(5,270
)
   $
(4,090
)
                         
Accrued/Prepaid benefit
c
ost, net
  
 
 
 
  
 
 
 
  
 
 
 
Benefit obligation
  
$
(21,059
)
   $
(20,427
)
   $
(19,324
)
Fair value of assets
  
 
17,038
      
16,131
      
17,130
  
Unrecognized net actuarial loss
  
 
8,250
      
8,627
      
6,922
  
Unrecognized prior service cost
  
 
(449
)
    
(559
)
    
(669
)
Deferred tax liability
  
 
(1,323
)
    
(1,294
)
    
(1,395
)
Prepaid benefit cost included in other
assets
  
$
2,457
     $
2,478
     $
2,664
  
                         
Components of net periodic benefit cost
  
 
 
 
  
 
 
 
  
 
 
 
Service cost
  
$
694
     $
620
     $
524
  
Interest cost
  
 
757
      
669
      
663
  
Expected return on plan assets
  
 
(1,110
)
    
(1,166
)
    
(1,112
)
Amortization of prior service cost
  
 
(110
)
    
(110
)
    
(110
)
Recognized net actuarial loss
  
 
572
      
414
      
262
  
Net periodic benefit cost
  
$
803
     $
427
     $
227
  
                         
Other changes in plan assets and benefit obligations recognized in other comprehensive
loss
  
 
 
 
  
 
 
 
  
 
 
 
Net
(gain) loss
  
$
(377
)
   $
1,705
     $
1,640
  
Amortization of prior service cost
  
 
110
      
110
      
110
  
Deferred income tax
expense (benefit)
 
 
93
      
(635
)
    
(612
)
Total recognized
  
$
(174
)
   $
1,180
     $
1,138
  
                         
Total recognized in net periodic benefit cost and other comprehensive
loss
  
$
536
     $
2,242
     $
1,977
  
                         
Weighted average assumptions at end of the year
  
 
 
 
  
 
 
 
  
 
 
 
Discount rate used for net periodic pension cost
  
 
4.00
%
    
3.75
%
    
4.50
%
Discount rate used for disclosure
  
 
4.00
%
    
4.00
%
    
3.75
%
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
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
    
$
---
  
   
Fair Value Measurements at
December 31, 20
1
5
  



Asset Category
  
Total
    
Quoted Prices in
Active Markets for
Identical Assets
(Level 1)
    
Significant
Observable Inputs
(Level 2)
   
Significant
Unobservable Inputs
(Level 3)
  
Cash
   $
876
     $
876
     $
---
     $
---
  
Equity securities:
                                
U. S. companies
    
9,600
      
9,600
      
---
      
---
  
International companies
    
404
      
404
      
---
      
---
  
Equities mutual funds
(1)
    
195
      
195
      
---
      
---
  
U. S. government agencies and corporations
    
104
      
---
      
104
      
---
  
State and political subdivisions
    
233
      
---
      
233
      
---
  
Corporate bonds
– investment grade
(2)
    
4,719
      
---
      
4,719
      
---
  
Total pension plan assets
   $
16,131
     $
11,075
     $
5,056
     $
---
  
Schedule of Expected Benefit Payments [Table Text Block]
2017
    
$
5,666
  
2018
    
$
1,067
  
2019
    
$
786
  
2020
    
$
1,350
  
20
21
    
$
472
  
2022 - 2026    
$
4,833