Note C - Investments Available for Sale (Detail) - Unrealized Holding Gains (Losses) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011
Gross unrealized holding losses	$ 3

This item represents the gross unrealized losses for securities, at a point in time, which are categorized neither as held-to-maturity nor trading securities.

No definition available.

Name:	us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLosses1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant