Quarterly report pursuant to Section 13 or 15(d)

Earnings per share - Additional Information (Detail)

v2.3.0.15
Earnings per share - Additional Information (Detail)
3 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Earnings Per Share Disclosure [Line Items]    
Number of potentially dilutive stock option and warrants excluded from the calculation of earnings per share 170,000 105,000