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Note 10 - Employment Benefit and Retirement Plans (Tables)
 12 Months Ended
Dec. 31, 2017
Notes Tables  
Employee Stock Ownership Plan (ESOP) Disclosures [Table Text Block]
   
December 31,
  
   
2017
    
2016
  
Shares allocated
    
104,272
      
85,493
  
Shares withdrawn from the plan
    
(21,030
 )    
(22,050
 )
Unallocated shares
    
177,418
      
196,197
  
   Total ESOP shares
    
260,660
      
259,640
  
Fair value of unallocated shares
   $
2,561,916
     $
2,497,588
  
Schedule of Employee Benefit and Retirement Plans [Table Text Block]
   
December 31,
  
   
2017
    
2016
  
Number of participants:
                
Retirees
    
4
      
4
  
Active directors - not yet eligible
    
2
      
2
  
Total
    
6
      
6
  
   
December 31,
  
   
2017
    
2016
  
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,
  
   
2017
    
2016
  
 
  
(Amounts in thousands)
  
Change in benefit obligation
      
Benefit obligation at beginning of year
   $
318
     $
335
  
Service cost
    
-
      
-
  
Interest cost
    
10
      
11
  
Actuarial loss
    
14
      
3
  
Benefits paid
    
(31
 )    
(31
 )
Assumed liability
    
-
      
-
  
Benefit obligation at end of year
    
311
      
318
  
                 
Change in plan assets
  
 
 
 
  
 
 
 
Employer contributions
    
31
      
31
  
Benefits paid
    
(31
 )    
(31
 )
Fair value of plan assets at year end
    
-
      
-
  
                 
Funded status
    
(311
 )    
(318
 )
Actuarial loss
    
14
      
3
  
Net amount recognized
   $
(297
 )   $
(315
 )
   
Years ended December 31,
  
   
2017
    
2016
  
 
  
(Amounts in thousands)
  
Change in benefit obligation
      
Benefit obligation at beginning of year
   $
287
     $
277
  
Service cost
    
6
      
7
  
Interest cost
    
9
      
11
  
Actuarial loss (gain)
    
(6
 )    
(5
 )
Plan amendments
    
-
      
-
  
Benefits paid
    
(8
 )    
(8
 )
Retiree contributions
    
5
      
5
  
Benefit obligation at end of year
    
293
      
287
  
                 
Change in plan assets
  
 
 
 
  
 
 
 
Employer contributions
    
4
      
3
  
Retiree contributions
    
5
      
5
  
Benefits paid
    
(9
 )    
(8
 )
Fair value of plan assets at year end
    
-
      
-
  
                 
Funded status
    
(293
 )    
(287
 )
Actuarial loss (gain)
    
(119
 )    
(125
 )
Net amount recognized
   $
(412
 )   $
(412
 )
Schedule of Amounts Recognized in Balance Sheet [Table Text Block]
   
December 31,
  
   
2017
    
2016
  
Accumulated post-retirement benefit obligation:
                
Active participants
   $
(116,478
 )   $
(113,270
 )
Retired participants including beneficiaries
    
(194,805
 )    
(205,196
 )
Total
    
(311,283
 )    
(318,466
 )
Plan assets at fair value
    
-
      
-
  
Funded status
    
(311,283
 )    
(318,466
 )
Actuarial loss
    
14,380
      
2,963
  
(Accrued) cost included in other liabilities
   $
(296,903
 )   $
(315,503
 )
   
December 31,
  
   
2017
    
2016
  
Accumulated post-retirement benefit obligation:
                
Retirees
   $
(82,675
 )   $
(78,426
 )
Active employees - fully eligible
    
-
      
-
  
Active employees - not yet eligible
    
(210,774
 )    
(208,265
 )
Total
    
(293,449
 )    
(286,691
 )
Plan assets at fair value
    
-
      
-
  
Funded status
    
(293,449
 )    
(286,691
 )
Actuarial (gain)
    
(118,270
 )    
(125,028
 )
(Accrued) cost included in other liabilities
   $
(411,719
 )   $
(411,719
 )
Schedule of Net Benefit Costs [Table Text Block]
   
Years ended December 31,
  
   
2017
    
2016
  
Service cost
   $
-
     $
-
  
Interest cost
    
10,116
      
11,346
  
Amortization net gain
    
14,380
      
2,963
  
Net cost (benefit)
   $
24,496
     $
14,309
  
   
Years ended December 31,
  
   
2017
    
2016
  
Service cost
   $
6,319
     $
6,537
  
Interest cost
    
8,993
      
11,363
  
Amortization net gain
    
(30,083
 )    
(20,070
 )
Net cost (benefit)
   $
(14,771
 )   $
(2,170
 )