Note 3 - Revenue from External Customers (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Asia [Member]
Segment revenue	$ 47,149	$ 77,954	$ 125,027
Europe [Member]
Segment revenue	1,380	1,458	1,680
Latin America [Member]
Segment revenue	4,939	5,128	5,669
UNITED STATES
Segment revenue	5,184	1,742	1,866
Segment revenue	$ 58,652	$ 86,282	$ 134,242

Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

Name:	us-gaap_SalesRevenueNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration