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Note 1 - Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Jun. 30, 2017
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
    Years ended June 30,
    2017   2016   2015
    (in thousands, except share and per amounts)
Net earnings   $
11,123
     $
8,648
     $
9,055
  
Weighted average number of common shares outstanding assuming no exercise of outstanding options    
10,279,818
      
10,399,393
      
10,459,924
  
Dilutive stock options using the treasury stock method    
(33
 )    
-
      
-
  
Dilutive common shares outstanding    
10,279,785
      
10,399,393
      
10,459,924
  
Basic earnings per common share   $
1.08
     $
0.83
     $
0.87
  
Diluted earnings per common share   $
1.08
     $
0.83
     $
0.87