Note 6 - Segment Information (Detail) - Major Customers (Customer A [Member])	3 Months Ended
Mar. 31, 2013	Mar. 31, 2012
Customer A [Member]
A	34.00%	29.00%

Percentage of revenue generated from a single external customer that accounts for 10 percent or more of an entity's revenues.

No definition available.

Name:	us-gaap_EntityWideRevenueMajorCustomerPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration