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Note 7 - Accumulated Other Comprehensive Income (Loss) (Tables)
 3 Months Ended
Sep. 30, 2020
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, 2020
   $
5,393
     $
(1,133
)
   $
4,260
  
 
Unrealized holding gain on available-for-sale securities arising during the period    
70
      
(14
)
    
56
  
(a)(b)
Balance as of September 30, 2020
   $
5,463
     $
(1,147
)
   $
4,316
  
 
                           
Balance as of June 30, 2019
   $
1,982
     $
(416
)
   $
1,566
  
 
Unrealized holding gain on available-for-sale securities arising during the period
    
818
      
(171
)
    
647
  
 
Amounts reclassified from accumulated other comprehensive income
    
(106
)
    
22
      
(84
)
(a)(b)
Net current period other comprehensive income
    
712
      
(149
)
    
563
  
 
Balance after reclassification as of September 30, 2019
   $
2,694
     $
(565
)
   $
2,129