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Note 6 - Accumulated Other Comprehensive Income (Loss) (Tables)
 3 Months Ended
Sep. 30, 2018
Notes Tables  
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
   
Pretax
    
Tax Effect
    
After-tax
  
Affected Line
Item in
Consolidated
Statements of
Income
Balance as of June 30, 2018
   $
(2,069
)
   $
434
     $
(1,635
)
 
Unrealized holding loss on available-for-sale securities arising during the period
    
(893
)
    
188
      
(705
)
 
Amounts reclassified from accumulated other comprehensive income
    
(587
)
    
124
      
(463
)
(a)(b)
Net current period other comprehensive loss
    
(1,480
)
    
312
      
(1,168
)
 
Balance after reclassification as of September 30, 2018
   $
(3,549
)
   $
746
     $
(2,803
)
 
                           
Balance as of June 30, 2017
   $
675
     $
(230
)
   $
445
  
 
Unrealized holding gains on available-for-sale securities arising during the period
    
104
      
(35
)
    
69
  
 
Amounts reclassified from accumulated other comprehensive income
    
(38
)
    
13
      
(25
)
(a)(b)
Net current period other comprehensive income
    
66
      
(22
)
    
44
  
 
Balance as of September 30, 2017
   $
741
     $
(252
)
   $
489