Note 6 - Convertible Debt and Derivative Liability (Details Textual)	Mar. 31, 2019 USD ($) shares	Oct. 26, 2018	Oct. 03, 2018 $ / shares shares	Dec. 31, 2018 USD ($) yr $ / shares	Sep. 30, 2018 USD ($)	Sep. 28, 2018 USD ($)
Stock Issued During Period, Shares, Inducement for Bridge Loan | shares			650,000
Maximum [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares				$ 609.38
Warrants in Connection with Convertible Promissory Note [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | shares			1,071,776
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares			$ 1.155
Class of Warrant or Right, Vesting Period		180 days
Warrants and Rights Outstanding, Term			5 years
Class of Warrant or Right, Fair Value per Warrant | $ / shares				$ 0.5361
Warrants and Rights Outstanding						$ 574,631
Derivative Liability, Total				$ 272,745	$ 645,008
Warrants in Connection with Convertible Promissory Note [Member] | Measurement Input, Discount Rate [Member]
Warrants and Rights Outstanding, Measurement Input				0.0294
Warrants in Connection with Convertible Promissory Note [Member] | Measurement Input, Expected Term [Member]
Warrants and Rights Outstanding, Measurement Input | yr				5
Warrants in Connection with Convertible Promissory Note [Member] | Measurement Input, Price Volatility [Member]
Warrants and Rights Outstanding, Measurement Input				0.59
Subsequent Event [Member] | Warrants in Connection with Convertible Promissory Note [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | shares	1,336,805
Securities Purchase Agreements [Member] | Convertible Promissory Note [Member]
Debt Instrument, Face Amount						$ 2,297,727
Debt Instrument, Interest Rate, Stated Percentage			8.00%
Interest Guaranteed Period			1 year
Debt Instrument, Convertible, Conversion Price, Percentage of Lowers Volume-weighted Average Price of Common Stock			70.00%
Debt Instrument, Convertible, Threshold Trading Days			20
Conversion Shares, Sum of Number of Conversion Shares Plus Inducement Shares | shares			2,678,328
Securities Purchase Agreements [Member] | Convertible Promissory Note [Member] | Maximum [Member]
Debt Instrument, Convertible, Conversion Price | $ / shares			$ 1
Securities Purchase Agreements [Member] | Convertible Promissory Note [Member] | Subsequent Event [Member]
Debt Instrument, Face Amount	$ 2,865,909
Proceeds from Notes Payable, Total	$ 500,000