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Note 4 - Investment Unit (Details Textual) - USD ($)			1 Months Ended	3 Months Ended	12 Months Ended
	Apr. 03, 2018	Mar. 12, 2014	Dec. 31, 2013	Mar. 31, 2018	Dec. 31, 2019	Mar. 31, 2020	Dec. 31, 2018
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)					$ 1.45	$ 1.45	$ 2.36
Fair Value Adjustment of Warrants			$ 2,500,000		$ 0
Conversion of Preferred Stock to Common Stock [Member]
Conversion of Stock, Shares Issued (in shares)	1,235,219			9,324,177
Series B Preferred Stock [Member]
Stock Issued During Period, Shares, New Issues (in shares)		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 (in dollars per share)		$ 0.001				$ 0.001
Promissory Note [Member]
Contingent Debt						$ 4,500,000
Contingent Debt, Interest Rate						8.00%

X

- Definition

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

+ References

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- Definition

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- Definition

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

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Amount of expense (income) related to adjustment to fair value of warrant liability.

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Number of new stock issued during the period.

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