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Note 4 - Investment Unit (Details Textual) - USD ($)			1 Months Ended		9 Months Ended
	Jun. 30, 2018	Mar. 12, 2014	Apr. 30, 2018	Dec. 31, 2013	Sep. 30, 2019	Dec. 31, 2018	Dec. 31, 2017
Class of Warrant or Right, Exercise Price of Warrants or Rights					$ 4.60	$ 4.60	$ 5.17
Fair Value Adjustment of Warrants				$ 2,500,000	$ 0
Conversion of Preferred Stock to Common Stock [Member]
Conversion of Stock, Shares Issued	9,324,177		1,235,219
Series B Preferred Stock [Member]
Stock Issued During Period, Shares, New Issues		184,797
Warrant Issued to TETF [Member]
Class of Warrant or Right, Purchase Percentage					80.00%
Warrant Discount Rate					20.00%
Class of Warrant or Right, Exercise Price of Warrants or Rights		$ 0.001			$ 0.001
Promissory Note [Member]
Contingent Debt					$ 4,500,000
Contingent Debt, Interest Rate					8.00%

X

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Percentage of total value of the right to purchase a warrant.

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- Definition

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

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Number of new stock issued during the period.

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