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Note 13 - Stock-based Compensation and Purchase Plans (Tables)
 12 Months Ended
Jun. 30, 2017
Notes Tables  
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]
 
 
Restricted Stock Awards
 
 
 
Number
 
 
Aggregate
 
 
 
of
 
 
Intrinsic
 
 
 
Shares
 
 
Value
 
Outstanding, June 30, 2016
    
104,525
    $
8,636,901
  
Granted
   
51,563
     
 
  
Exercised / vested
    
(36,422
 )   $
841,757
  
Canceled
   
(3,963
 )    
 
  
Outstanding, June 30, 2017
    
115,703
    $
10,494,262
 
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
 
 
2017
 
 
2016
 
 
2015
 
Risk-free interest rates
    
0.71
 %    
1.10
 %    
0.88
 %
Expected life of option grants (in years)
    
3
      
3
      
3
  
Expected volatility of underlying stock
    
25.7
 %    
26.6
 %    
32.0
 %
Expected quarterly dividends (per share)
   $
0.14
    $
0.12
     $
0.10
 
Share-based Compensation, Stock Options, Activity [Table Text Block]
 
 
Annual Component
 
 
 
 
 
 
Performance Stock Units
 
 
 
 
 
 
 
Weighted
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Number
 
 
Average
 
 
Aggregate
 
 
Number
 
 
Aggregate
 
 
 
of
 
 
Exercise
 
 
Intrinsic
 
 
of
 
 
Intrinsic
 
 
 
Shares
 
 
Price
 
 
Value
 
 
Shares
 
 
Value
 
Non-vested, June 30, 2016
    
30,597
    $
52.62
    $
286,195
      
54,736
    $
3,926,057
 
Granted
   
16,661
     
61.97
     
 
      
30,326
     
 
  
Vested
    
(11,226
 )   $
45.65
    $
472,362
     
(26,749
 )   $
1,814,874
 
Forfeited
    
(325
 )    
59.52
     
 
      
(5,422
 )    
 
  
Non-vested, June 30, 2017
    
35,707
    $
59.11
     $
318,334
     
52,890
     $
4,254,256