Note 3 - Lincoln Park Financing (Details Textual) - USD ($)		3 Months Ended	9 Months Ended		14 Months Ended
	Aug. 25, 2017	Sep. 30, 2018	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018
Proceeds from Issuance of Common Stock			$ 826,279	$ 22,500
Lincoln Park Capital Fund, LLC [Member]
Stock Purchase Agreement, Maximum Amount of Common Stock	$ 10,000,000
Stock Purchase Agreement, Maximum Shares of Common Stock to be Sold in a Single Business Day, Tier One	50,000
Stock Purchase Agreement, Maximum Shares of Common Stock to be Sold in a Single Business Day, Tier Two	75,000
Stock Purchase Agreement, Maximum Shares of Common Stock to be Sold in a Single Business Day, Tier Three	100,000
Stock Purchase Agreement, Maximum Shares of Common Stock to be Sold in a Single Business Day, Tier Four	200,000
Stock Purchase Agreement, Maximum Value of Total Common Stock to be Sold in a Single Business Day	$ 500,000
Stock Issued During Period, Shares, New Issues	488,998	1,543,982	2,800,733
Pro Forma Information, Stock Purchase Agreement, Stock Purchase Requested	$ 25,000
Pro Forma Information, Stock Purchase Agreement, Stock Purchase Requested, Additional Commitment Common Stock Issued	1,222
Pro Forma Information, Stock Purchase Agreement, Additional Commitment Shares, Numerator Value of Total Shares Calculation	$ 25,000
Pro Forma Information, Stock Purchase Agreement, Additional Commitment Shares, Denominator Value of Total Shares Calculation	$ 10,000,000
Pro Forma Information, Stock Purchase Agreement, Additional Commitment Shares, Multiplier of Total Shares Calculation	488,998
Proceeds from Issuance of Common Stock		$ 445,476	$ 826,279		$ 3
Stock Issued During Period, Additional Commitment Shares, New Issues		21,780	40,400
Lincoln Park Capital Fund, LLC [Member] | Maximum [Member]
Stock Purchase Agreement, Share Price, Tier One	$ 0.50
Stock Purchase Agreement, Share Price, Tier Two	0.74
Stock Purchase Agreement, Share Price, Tier Three	1.24
Lincoln Park Capital Fund, LLC [Member] | Minimum [Member]
Stock Purchase Agreement, Share Price, Tier Two	0.50
Stock Purchase Agreement, Share Price, Tier Three	0.75
Stock Purchase Agreement, Share Price, Tier Four	$ 1.25