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Note 6 - Accumulated Other Comprehensive Income (Tables)
 9 Months Ended
Mar. 31, 2017
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 December 31, 2016
   $
(246
 )   $
83
     $
(163
 )
 
Unrealized holding gain on available-for-sale securities arising during the period
    
336
      
(114
 )    
222
  
 
Amounts reclassified from accumulated other comprehensive income
    
(17
 )    
5
      
(12
 )
(a)(b)
Net current period other comprehensive income
    
319
      
(109
 )    
210
  
 
Balance as of March 31, 2017
   $
73
     $
(26
 )   $
47
  
 
                           
Balance as of December 31, 2015
   $
1,731
     $
(589
 )   $
1,142
  
 
Unrealized holding gain on available-for-sale securities arising during the period
    
1,288
      
(438
 )    
850
  
 
Amounts reclassified from accumulated other comprehensive income
    
(87
 )    
30
      
(57
 )
(a)(b)
Net current period other comprehensive income
    
1,201
      
(408
 )    
793
  
 
Balance as of March 31, 2016
   $
2,932
     $
(997
 )   $
1,935
  
 
   
Pretax
    
Tax Effect
    
After-tax
  
Affected Line
Item in
Consolidated
Statements of
Income
Balance as of June 30, 2016
   $
3,621
     $
(1,232
 )   $
2,389
  
 
Unrealized holding loss on available-for-sale securities arising during the period
    
(3,406
 )    
1,158
      
(2,248
 )
 
Amounts reclassified from accumulated other comprehensive income
    
(142
 )    
48
      
(94
 )
(a)(b)
Net current period other comprehensive loss
    
(3,548
 )    
1,206
      
(2,342
 )
 
Balance as of March 31, 2017
   $
73
     $
(26
 )   $
47
  
 
                           
Balance as of June 30, 2015
   $
1,363
     $
(464
 )   $
899
  
 
Unrealized holding gain on available-for-sale securities arising during the period
    
1,691
      
(574
 )    
1,117
  
 
Amounts reclassified from accumulated other comprehensive income
    
(122
 )    
41
      
(81
 )
(a)(b)
Net current period other comprehensive income
    
1,569
      
(533
 )    
1,036
  
 
Balance as of March 31, 2016
   $
2,932
     $
(997
 )   $
1,935