Statement of Stockholders' Equity (Unaudited) (Parentheticals)	Jun. 30, 2018 $ / shares
Series E Warrants [Member] \| Common Stock [Member]
Warrant exercises, exercise price per share (in dollars per share)	$ 1
Common Stock [Member] \| Over-Allotment Option [Member]
Price of shares issued (in dollars per share)	0.9497
Warrant exercises, exercise price per share (in dollars per share)

Exercise price per share or per unit of warrants or rights outstanding.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(i)(4))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

Name:	us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant