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Note 6 - Accrued Retirement Benefits (Tables)
 12 Months Ended
Dec. 31, 2016
Notes Tables  
Schedule of Defined Benefit Plans Disclosures [Table Text Block]
   
2016
    
2015
  
   
(in thousands)
  
                 
Defined benefit pension plans
   $
7,560
    $
6,264
 
Non-qualified retirement plans
    
1,674
     
4,366
 
Total
    
9,234
     
10,630
 
Less current portion
    
(175
 )    
(378
 )
Non-current portion of accrued retirement benefits
   $
9,059
    $
10,252
 
Changes in Projected Benefit Obligations, Fair Value of Plan Assets, and Funded Status of Plan [Table Text Block]
 
 
2016
 
 
2015
 
   
(in thousands)
  
                 
Change in benefit obligations:
                
Benefit obligations at beginning of year
   $
66,852
    $
71,349
 
Interest cost
    
2,804
     
2,753
 
Actuarial loss (gain)
    
1,042
     
(2,783
 )
Benefits paid
    
(4,217
 )    
(4,467
 )
Lump sum payments
    
(10,103
 )    
-
 
Benefit obligations at end of year
    
56,378
     
66,852
 
                 
Change in plan assets:
                
Fair value of plan assets at beginning of year
    
56,434
     
64,341
 
Actual return on plan assets
    
5,188
     
(3,463
 )
Employer reimbursement for retirement benefits
    
(1,054
 )    
(271
 )
Employer contributions
    
928
     
294
 
Benefits paid
    
(4,217
 )    
(4,467
 )
Lump sum payments
    
(10,103
 )    
-
 
                 
Fair value of plan assets at end of year
    
47,176
     
56,434
 
                 
Funded status
   $
(9,202
 )   $
(10,418
 )
                 
Accumulated benefit obligations
   $
56,378
    $
66,852
 
                 
Schedule of Assumptions Used [Table Text Block]
Weighted average assumptions used to determine benefit
obligations at December 31:
                
Discount rate
  
4.07%
-
4.14%
  
4.30%
-
4.44%
Expected long-term return on plan assets
  
 
5.00%
 
  
 
7.00%
 
Rate of compensation increase
  
 
n/a
 
  
 
n/a
 
Weighted average assumptions used to determine net periodic benefit cost:  
2016
    
2015
  
Pension benefits:
                    
Discount rate
  
4.30%
-
4.44%
    
3.96%
-
4.07%
  
Expected long-term return on plan assets
  
 
5.00%
 
    
 
5.32%
 
  
Rate of compensation increase
  
 
n/a
 
    
 
n/a
 
  
Schedule of Net Benefit Costs [Table Text Block]
 
 
2016
 
 
2015
 
   
(in thousands)
  
                 
Pension and other benefits:
                
Interest cost
   $
2,804
    $
2,753
 
Expected return on plan assets
    
(2,713
 )    
(3,306
 )
Recognized net actuarial loss
    
1,030
     
843
 
Settlement/Curtailment Expense
    
3,958
     
-
 
Pension expense
   $
5,079
    $
290
 
                 
Other changes in plan assets and benefit obligations
recognized in comprehensive income:
                
Net (gain) loss
   $
(1,384
 )   $
3,986
 
Recognized loss
    
(4,988
 )    
(893
 )
Total recognized (gain) loss in comprehensive income
  $
(6,372
 )   $
3,093
 
Fair Value, Assets Measured on Recurring Basis [Table Text Block]
   
2016 Fair Value Measurements (in thousands)
  
   
Quoted Prices
in Active Markets
for Identical
Assets (Level 1)
    
Significant
Other Observable
Inputs (Level 2)
    
Total
  
AHGT pooled equity funds
   $
-
    $
7,177
    $
7,177
 
AHGT pooled fixed income funds
    
-
     
39,025
     
39,025
 
Cash management funds
    
-
     
974
     
974
 
    $
-
    $
47,176
    $
47,176
 
   
2015 Fair Value Measurements (in thousands)
  
   
Quoted Prices in
Active Markets
for Identical
Assets (Level 1)
    
Significant Other
Observable
Inputs (Level 2)
    
Total
  
AHGT pooled equity funds
   $
-
    $
8,120
    $
8,120
 
AHGT pooled fixed income funds
    
-
     
46,069
     
46,069
 
Cash management funds
    
-
     
2,245
     
2,245
 
    $
-
    $
56,434
    $
56,434
 
Schedule of Expected Benefit Payments [Table Text Block]
2017
 
 
   $
4,283
 
2018
 
 
    
4,180
 
2019
 
 
    
4,123
 
2020
 
 
    
4,084
 
2021
 
 
    
3,995
 
2022
-
2026
    
18,332