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Note 10 - Employment Benefit and Retirement Plans (Tables)
 12 Months Ended
Dec. 31, 2016
Notes Tables  
Employee Stock Ownership Plan (ESOP) Disclosures [Table Text Block]
   
December 31,
  
   
2016
    
2015
  
Shares allocated
    
85,493
     
55,964
 
Shares withdrawn from the plan
    
(22,050
 )    
(18,497
 )
Unallocated shares
    
196,197
     
20,350
 
Total ESOP shares
    
259,640
     
57,817
 
Fair value of unallocated shares
   $
2,497,588
    $
204,518
 
Schedule of Employee Benefit and Retirement Plans [Table Text Block]
   
December 31,
  
   
2016
    
2015
  
Number of participants:
                
Retirees
    
4
     
4
 
Active directors - not yet eligible
    
2
     
2
 
Total
    
6
     
6
 
   
December 31,
  
   
2016
    
2015
  
Number of participants:
                
Retirees
    
3
     
3
 
Active employees - fully eligible
    
-
     
-
  
Active employees - not yet eligible
    
3
     
3
 
Total
    
6
     
6
  
Schedule of Changes in Projected Benefit Obligations [Table Text Block]
   
Years ended December 31,
  
   
2016
    
2015
  
   
(Amounts in thousands)
  
Change in benefit obligation
                
Benefit obligation at beginning of year
   $
335
    $
353
 
Service cost
    
-
     
-
 
Interest cost
    
11
     
12
 
Actuarial loss
    
3
     
1
 
Benefits paid
    
(31
 )    
(31
 )
Assumed liability
    
-
     
-
 
Benefit obligation at end of year
    
318
     
335
 
                 
Change in plan assets
 
 
 
 
 
 
 
 
Employer contributions
    
31
     
31
 
Benefits paid
    
(31
 )    
(31
 )
Fair value of plan assets at year end
    
-
     
-
 
                 
Funded status
    
(318
 )    
(335
 )
Actuarial loss
   
3
     
1
 
Net amount recognized
   $
(315
 )   $
(334
 )
   
Years ended December 31,
  
   
2016
    
2015
  
Change in benefit obligation
  
(Amounts in thousands)
  
Benefit obligation at beginning of year
   $
277
    $
341
 
Service cost
    
7
     
7
 
Interest cost
    
11
     
14
 
Actuarial loss (gain)
   
(5
 )    
(79
 )
Plan amendments
    
-
      
(3
 )
Benefits paid
    
(8
 )    
(8
 )
Retiree contributions
    
5
     
5
 
Benefit obligation at end of year
    
287
     
277
 
                 
Change in plan assets
 
 
 
 
 
 
 
 
Employer contributions
    
3
     
3
 
Retiree contributions
    
5
     
5
 
Benefits paid
    
(8
 )    
(8
 )
Fair value of plan assets at year end
    
-
     
-
 
                 
Funded status
    
(287
 )    
(277
 )
Actuarial loss (gain)
    
(125
 )    
(135
 )
Net amount recognized
   $
(412
 )   $
(412
 )
Schedule of Amounts Recognized in Balance Sheet [Table Text Block]
   
December 31,
  
   
2016
    
2015
  
Accumulated post-retirement benefit obligation:
                
Active participants
   $
(113,270
 )   $
(100,296
 )
Retired participants including beneficiaries
    
(205,196
 )    
(234,461
 )
Total
    
(318,466
 )    
(334,757
 )
Plan assets at fair value
    
-
     
-
 
Funded status
    
(318,466
 )    
(334,757
 )
Actuarial loss
    
2,963
     
654
 
(Accrued) cost included in other liabilities
   $
(315,503
 )   $
(334,103
 )
   
December 31,
  
   
2016
    
2015
  
Accumulated post-retirement benefit obligation:
                
Retirees
   $
(78,426
 )   $
(71,177
 )
Active employees - fully eligible
    
-
     
-
 
Active employees - not yet eligible
    
(208,265
 )    
(205,756
 )
Total
    
(286,691
 )    
(276,933
 )
Plan assets at fair value
    
-
     
-
 
Funded status
    
(286,691
 )    
(276,933
 )
Actuarial (gain)
    
(125,028
 )    
(134,786
 )
(Accrued) cost included in other liabilities
   $
(411,719
 )   $
(411,719
 )
Schedule of Net Benefit Costs [Table Text Block]
   
Years ended December 31,
  
   
2016
    
2015
  
Service cost
   $
-
    $
-
 
Interest cost
    
11,346
     
11,816
 
Amortization net gain
    
2,963
     
654
 
Net cost (benefit)
   $
14,309
    $
12,470
 
   
Years ended December 31,
  
   
2016
    
2015
  
Service cost
   $
6,537
    $
6,755
 
Interest cost
    
11,363
     
13,733
 
Amortization net gain
    
(20,070
 )    
(10,057
 )
Net cost (benefit)
   $
(2,170
 )   $
10,431