Discontinued Operations (Details Textual) (USD $) In Millions, unless otherwise specified	Apr. 03, 2012
Discontinued Operations [Abstract]
Agreement to sell TV station	$ 3

Disposal group including discontinued operation agreement sell price.

No definition available.

Name:	sga_DisposalGroupIncludingDiscontinuedOperationAgreementSellPrice
Namespace Prefix:	sga_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant