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Note 8 - Short-term Borrowings (Tables)
 12 Months Ended
Jun. 30, 2020
Notes Tables  
Schedule of Short-term Debt [Table Text Block]
   
20
20
    
201
9
  
Balance at June 30
   $
6,943
     $
3,686
  
Average balance during the year
    
4,306
      
3,521
  
Maximum month-end balance
    
7,705
      
3,975
  
Average interest rate during the year
    
1.00
%
    
1.45
%
Weighted average rate, June 30
    
0.25
%
    
1.39
%
Schedule of Repurchase Agreements [Table Text Block]
   
Overnight and Continuous
  
   
20
20
    
201
9
  
U.S. government-sponsored entities and agencies pledged
   $
1,031
     $
998
  
Residential mortgage-backed securities pledged
    
2,720
      
3,938
  
Commercial mortgage-backed securities
    
3,288
      
—
  
Total pledged
   $
7,039
     $
4,936
  
Repurchase agreements
   $
6,943
     $
3,686