Condensed Consolidated Statements of Changes in Equity (Parentheticals)	3 Months Ended
Mar. 31, 2018 USD ($)
Private Placement [Member] \| Investor Warrants [Member]
Proceeds allocated to warrant liabilities	$ 1,890,000
Private Placement [Member] \| Placement Agent Warrants [Member]
Proceeds allocated to warrant liabilities	390,000
Private Placement [Member]
Direct offering costs	1,200,000
Investor Warrants [Member]
Proceeds allocated to warrant liabilities	664,000
Placement Agent Warrants [Member]
Proceeds allocated to warrant liabilities	137,000
Proceeds allocated to warrant liabilities	$ 801,000

Amount of decrease in additional paid in capital (APIC) resulting from direct costs associated with issuing stock. Includes, but is not limited to, legal and accounting fees and direct costs associated with stock issues under a shelf registration.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration