Note 6 - Warrants (Details Textual) - USD ($)			3 Months Ended
	Dec. 30, 2016	Jul. 08, 2016	Mar. 31, 2019	Mar. 31, 2018	Mar. 05, 2019	Mar. 04, 2019	Jan. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Class of Warrant or Right, Exercise Price of Warrants or Rights			$ 1	$ 1				$ 1	$ 1
Gain (Loss) on Extinguishment of Debt, Total			$ (184,000)
Class of Warrant or Right, Issued During Period			3,861,041	2,611,513
Deemed Dividends			$ 342,000	$ 297,000
Warrants Issued as Part of Debt Extension [Member]
Gain (Loss) on Extinguishment of Debt, Total			$ (56,000)
Warrants Issued Concurrently with the Nine-month Note Payable [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights			637,500
Class of Warrant or Right, Exercise Price of Warrants or Rights			$ 0.25
Warrants and Rights Outstanding, Term			5 years
Discount On Convertible Note Payable			$ 89,000
Class of Warrant or Right, Percentage of Principal Value of Note, Numerator Value of Calculation			75.00%
Class of Warrant or Right, Denominator Value of Calculation			$ 0.25
Warrants Issued Concurrently With One Year Convertible Note [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights	$ 0.75	$ 0.65	$ 0.12
Class of Warrant or Right, Issued During Period	400,000	400,000
Increase (Decrease) Warrants Available for Exercise			2,426,666
Deemed Dividends			$ 342,000
Vernal Bay Investments, LLC [Member] | Warrants Issued as Part of Debt Extension [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights					1,734,375	1,387,500
Class of Warrant or Right, Exercise Price of Warrants or Rights					$ 0.20	$ 0.25
Maximum Investment Amount under Warrant					$ 346,875
Chappy Bean, LLC [Member] | Warrants Issued as Part of Debt Extension [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights					750,000	600,000
Class of Warrant or Right, Exercise Price of Warrants or Rights					$ 0.20
Lincoln Park Capital Fund, LLC [Member] | Warrants Issued as Consent for Variable Rate Date [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights							300,000
Class of Warrant or Right, Exercise Price of Warrants or Rights							$ 0.25
Warrants and Rights Outstanding, Term							5 years
Discount On Convertible Note Payable							$ 54,000