Notes Payable (Details) (USD $) In Thousands, unless otherwise specified	Jul. 31, 2012	Apr. 30, 2012
Credit facilities:
Notes Payable	$ 23,107	$ 21,325
Notes Payable, Other Payables [Member]
Credit facilities:
Notes Payable	4,453	4,486
Line Of Credit [Member] | Media Services [Member]
Credit facilities:
Notes Payable	2,440	0
Line Of Credit [Member] | Real Estate Operations and Corporate [Member]
Credit facilities:
Notes Payable	$ 16,214	$ 16,839