Note 7 - Debt - Repayments (Details) - USD ($) $ in Thousands				6 Months Ended
Jun. 30, 2017	Jun. 29, 2017	Jun. 27, 2017	Jun. 30, 2017
Series C Convertible Preferred Stock [Member]
Amount outstanding under the Series C shares	$ 748	$ 1,517	$ 550	$ 4,685

The cash outflow from the repayment of a long-term debt instrument which can be exchanged for a specified amount of another security, typically the entity's common stock, at the option of the issuer or the holder.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585

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