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Note 7 - Stockholders' Equity (Details Textual) - USD ($)			1 Months Ended	3 Months Ended		6 Months Ended
	May 18, 2018	Mar. 28, 2018	Jun. 30, 2018	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Units Issued, Price per Unit	$ 0.60
Proceeds from Issuance or Sale of Equity, Total	$ 5,500,000
Proceeds from Issuance or Sale of Equity, Net	4,819,000
Payments of Stock Issuance Costs	$ 681,000	$ 171,000
Stock Issued During Period, Shares, New Issues		609,636
Shares Issued, Price Per Share		$ 2.27
Proceeds from Issuance of Common Stock, Net		$ 1,213,000				$ 6,032,000
Allocated Share-based Compensation Expense, Total				$ 163,000	$ 181,000	$ 300,000	$ 428,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period						0
Class of Warrant or Right, Outstanding, Intrinsic Value			$ 0	$ 0		$ 0
Common Warrants [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights	$ 0.60
Warrants and Rights Outstanding, Term	5 years
Warrants Issused in Private Placement [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights		$ 2.68
Warrants and Rights Outstanding, Term		5 years 182 days
Class of Warrant or Right, Number of Securities Called by Warrants or Rights		304,818
Units [Member]
Number of Units Issued	6,475,001
Convertible Units, Number of Common Shares Called by Each Unit	1
Convertible Units, Number of Common Warrants Called by Each Unit	1
Units [Member] \| Common Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right	1
Pre-funded Units [member]
Number of Units Issued	2,691,666
Convertible Units, Number of Common Warrants Called by Each Unit	1
Convertible Units, Number of Pre-funded Warrants Called by Each Unit	1
Number of Units Exercised			2,691,666
Pre-funded Units [member] \| Common Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right	1
Pre-funded Units [member] \| Pre-funded Warrant [Member]
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right	1