Note 4 - Debt Obligations - Early Conversion of Unit Notes (Details) $ in Thousands	1 Months Ended
May 31, 2018 USD ($)
Debt Conversion, Original Debt, Amount	$ 4,626
Convertible Notes Maturing on June 1, 2018 [Member]
Debt Conversion, Original Debt, Amount	3,647
Convertible Notes Maturing on September 17, 2019 [Member]
Debt Conversion, Original Debt, Amount	284
Convertible Notes Maturing on December 31, 2019 [Member]
Debt Conversion, Original Debt, Amount	217
Convertible Notes, Maturing on June 20, 2020 [Member]
Debt Conversion, Original Debt, Amount	$ 478

The amount of the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4332-108586

Name:	us-gaap_DebtConversionOriginalDebtAmount1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration