Note 2 - Inventories (Details Textual) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Other Inventory, Demo, Gross	$ 4,209	$ 8,718

Gross amount of merchandise, goods, commodities, or supplies to which the entity holds the title and uses for the specific purpose of showing the benefits and features of the entity's products to existing or potential customers.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.6(a))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Name:	us-gaap_OtherInventoryDemo
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant