Note 5 - Convertible Debt (PIK Notes) (Details Textual) - Payment in Kind (PIK) Note [Member]	Jun. 30, 2017 $ / shares
Series 2023 Notes [Member]
Debt Instrument, Convertible, Conversion Price	$ 1.28
Series A Notes [Member]
Debt Instrument, Convertible, Conversion Price	$ 0.83

The price per share of the conversion feature embedded in the debt instrument.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 5
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6928298&loc=SL6031898-161870

Name:	us-gaap_DebtInstrumentConvertibleConversionPrice1
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant