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Shareholders' Equity - Additional Information (Detail) (USD $)
 12 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Monthly dividend $ 0.005    
Repurchasing amount $ 173,608    
Stock Options Granted   5,000  
Expected volatility factor based on historical volatility 49.90%    
Risk-free interest rate 2.40%    
Expected life 5 years 8 months 1 day    
Options Exercisable, Shares 25,000    
Options Exercisable, Weighted Average Exercise Price $ 18.71    
1997 Plan [Member]
      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares authorized under Stock Option Plan 400,000    
Options issued under Stock Option Plan vesting period, Description Over five years with 20 percent vesting on each anniversary date    
Stock Options Granted 0 5,000 0
Options Granted Under 1997 Plan, Fair Value   8,052  
Employees [Member]
      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Options Exercisable, Shares 25,000 22,000 20,180
Options Exercisable, Weighted Average Exercise Price $ 18.71 $ 19.21 $ 19.78
Common Class A [Member]
      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Repurchasing amount $ 173,608    
Class A common stock purchased 55,052 0 0
Conversion of shares of class C common stock for class A common stock, Shares 2,516 60 0
Common Class A [Member] | 1989 Plan [Member]
      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares authorized under Stock Option Plan 1,600,000    
Options issued under Stock Option Plan vesting period, Description Six months from the grant date or 20 percent on the first, second, third, fourth, and fifth anniversaries of the grant date    
Options issued under Stock Option Plan expiration 10 years    
Common Class A [Member] | Employees [Member]
      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Class A common stock granted 0 15,600 35,300
Class A common stock granted   $ 4.73 8.12
Common Class A [Member] | Director [Member]
      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Class A common stock granted 3,600 3,600 3,300
Class A common stock granted $ 4.16 $ 6.65 $ 8.10
Common Class C [Member]
      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Conversion of shares of class C common stock for class A common stock, Shares 2,516 60 0