Equity (Details Textual) (USD $)	1 Months Ended				3 Months Ended		9 Months Ended			0 Months Ended	1 Months Ended	9 Months Ended	0 Months Ended	1 Months Ended
	Dec. 31, 2012	Nov. 30, 2012	Oct. 31, 2012	Sep. 30, 2012	Apr. 30, 2013	Apr. 30, 2012	Apr. 30, 2013	Apr. 30, 2012	Nov. 21, 2012	Nov. 13, 2012 Class B common stock [Member]	Oct. 31, 2012 Class B common stock [Member]	Apr. 30, 2013 Class B common stock [Member]	Nov. 13, 2012 Class A common stock [Member]	Oct. 31, 2012 Class A common stock [Member]
Equity, Class of Treasury Stock [Line Items]
Aggregate purchase price of shares repurchased												$ 800,000
Stock repurchase program, shares authorized for repurchase												8,300,000
Stock repurchased in a fiscal year												77,843
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased					5,100,000		5,100,000
Dividend paid per share										$ 0.60	$ 0.15		$ 0.60	$ 0.15
Equity (Textual)
Dividends declared, per share						$ 0.15	$ 0.75	$ 0.51
Aggregate dividends paid			3,400,000				17,124,000
Percentage of subsidiary equity available for stock based compensation				10.00%
Stock based compensation on granted equity of subsidiary							1,200,000
Cash received on sale of Zedge stock to Shaman II L.P		100,000
Percentage of ownership before additional acquisition									11.10%
Percentage of ownership after additional acquisition									11.17%
Cash paid to purchase ownership percentage in subsidiary	$ 1,800,000						$ (1,804,000)
Ownership percentage increased in subsidiary	4.50%
Ownership percentage in subsidiary	86.10%
Equity method investment old ownership percentage in subsidiary	81.60%