Note 11 - Subsequent Event (Details Textual) - Subsequent Event [Member] - Warrants in Connection with Second Amendment [Member]	Apr. 26, 2018 $ / shares shares
Class of Warrant or Right, Number of Securities Called by Warrants or Rights \| shares	277,778
Class of Warrant or Right, Exercise Price of Warrants or Rights \| $ / shares	$ 0.32

Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares.

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)(2))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

Name:	us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant