Note 8 - Subsequent Events (Detail) (Subsequent Event [Member]) In Millions, unless otherwise specified	Apr. 30, 2013
Subsequent Event [Member]
Stock Repurchase Program, Number of Shares Authorized to be Repurchased	50.0

The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

No definition available.

Name:	us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant