Earnings Per Share - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014	Mar. 31, 2013
Repurchased Shares:
Repurchasing amount			$ 230,347	$ 84,983
Common Class A
Repurchased Shares:
Repurchased shares	35,065	22,203	76,511	22,203
Repurchasing amount	$ 120,610	$ 84,983	$ 230,347	$ 84,983
Common Class B
Repurchased Shares:
Repurchased shares			0
Common Class C
Repurchased Shares:
Repurchased shares			0
Stock Option
Antidilutive Securities Excluded from Computation of Earnings per Share [Line Items]
Options excluded from diluted EPS calculation	22,000	29,000	22,000	29,000