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Note 9 - Stock-based Compensation (Tables)
 12 Months Ended
Jun. 30, 2018
Notes Tables  
Share-based Compensation, Stock Options, Activity [Table Text Block]
   
Year Ended June 30,
  
   
2018
    
2017
  
   
 
 
 
  
Weighted
    
 
 
 
  
Weighted
  
   
Shares
    
Average
    
Shares
    
Average
  
   
Under
    
Exercise
    
Under
    
Exercise
  
   
Options
    
Price
    
Options
    
Price
  
Outstanding, beginning of year
    
265,000
     $
10.00
      
405,000
     $
10.24
  
Granted
    
—
     $
—
      
—
     $
—
  
Exercised
    
(229,375)
     $
10.00
      
(140,000)
     $
10.69
  
Forfeited
    
—
 
   $
—
      
—
     $
—
  
Cancelled
    
—
     $
—
      
—
     $
—
  
Outstanding, end of year
    
35,625
     $
10.01
      
265,000
     $
10.00
  
Aggregate intrinsic value
   $
454,937
      
 
     $
2,232,848
      
 
  
                                 
Exercisable, end of year
    
35,625
     $
10.01
      
265,000
     $
10.00
  
Aggregate intrinsic value
   $
454,937
      
 
     $
2.232,848
      
 
  
                                 
Available for grant, end of year
    
384,094
      
 
      
39,094
      
 
  
                                 
Weighted average fair value of options granted during the year
(1)
   $
—
      
 
     $
—
      
 
  
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block]
       
Options Outstanding
    
Options Exercisable
  
       
Number of
    
Weighted
    
 
 
 
  
Number of
    
Weighted
    
 
 
 
       
Shares
    
Average
    
Weighted
    
Shares
    
Average
    
Weighted
  
       
Under
    
Remaining
    
Average
    
Under
    
Remaining
    
Average
  
Range of Exercise
 
Outstanding
    
Contractual
    
Exercise
    
Outstanding
    
Contractual
    
Exercise
  
Price
  
Options
    
Life
    
Price
    
Options
    
Life
    
Price
  
$10.00
-
$10.99
    
35,625
      
0.2
     $
10.01
      
35,625
      
0.2
     $
10.01
  
Nonvested Restricted Stock Shares Activity [Table Text Block]
   
Number
of
Shares
    
Weighted Average
Fair
Value
Per
Share
  
Nonvested balance at June 30, 2016
    
102,332
     $
4.54
  
Granted
    
175,000
     $
21.29
  
Vested
    
(78,335
)
   $
10.22
  
Forfeited
    
—
     $
—
  
Nonvested balance at June 30, 2017
    
198,997
     $
17.03
  
Granted
    
155,000
     $
19.50
  
Vested
    
(54,999
)
   $
11.72
  
Forfeited
    
—
     $
—
  
Nonvested balance at June 30, 2018
    
298,998
     $
19.12