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Note 2 - Investments (Tables)
 12 Months Ended
Jun. 30, 2017
Notes Tables  
Investment [Table Text Block]
    June 30, 2017   June 30, 2016  
    Carrying Cost   Fair Value   Carrying Cost   Fair Value  
    (in thousands)  
Federal Reserve Bank Stock   $
1,955
     $
1,955
     $
1,955
     $
1,955
    
Federal Home Loan Bank Stock    
2,213
      
2,213
      
1,886
      
1,886
    
Mortgage-backed investment    
113
      
126
      
116
      
131
    
    $
4,281
     $
4,294
     $
3,957
     $
3,972