Marketable Securities (Details Textual) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended		6 Months Ended
	Jan. 31, 2017	Jan. 31, 2017	Jan. 31, 2016	Jan. 31, 2017	Jan. 31, 2016	Jul. 31, 2016
Marketable Securities (Textual)
Proceeds from maturities and sales of available-for-sale securities		$ 10,800	$ 9,900	$ 16,800	$ 18,700
Realized gains from sales of available-for-sale securities		300		300	$ 500
Unrealized losses, less than twelve months or longer
Zedge [Member]
Marketable Securities (Textual)
Shares received from subsidiary	23,227
Amount paid for related party shares received in connection with restricted stock	$ 74
Shares owned fair value	$ 77	$ 77		$ 77