Note 10 - Stockholders Equity (Details Textual) - USD ($)				1 Months Ended		12 Months Ended
	Jun. 29, 2018	Jun. 21, 2017	Dec. 21, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2019	Dec. 31, 2018	Nov. 12, 2019	Nov. 11, 2019	Jun. 30, 2019	Dec. 31, 2017
Class of Warrant or Right, Issued During Period						625,000
Class of Warrant or Right, Exercise Price of Warrants or Rights						$ 0.22
Class of Warrant or Right, Issued During Period, Exercise Price						$ 0.20
Class of Warrant or Right, Exercised During Period
Class of Warrant or Right, Exercised During Period, Exercise Price
Cross River Partners, L.P. [Member]
Class of Warrant or Right, Issued During Period				1,612,902
Class of Warrant or Right, Grants in Period, Grant-date Fair Value				$ 0.19
Warrants Expiration Period				5 years
Class of Warrant or Right, Issued During Period, Exercise Price				$ 0.31
Class of Warrant or Right, Exercised During Period	1,612,902
Class of Warrant or Right, Exercised During Period, Exercise Price	$ 0.005
Proceeds from Warrant Exercises	$ 500,000
Aggregate Intrinsic Value Of Warrants Exercised	$ 1,400,000
Warrants Issued in June 2016 [Member]
Class of Warrant or Right, Issued During Period					30,000
Class of Warrant or Right, Grants in Period, Grant-date Fair Value					$ 0.36
Class of Warrants or Rights, Vesting Period					1 year
Class of Warrants or Rights, Vested During the Period		15,000	15,000
Class of Warrant or Right, Exercise Price of Warrants or Rights							$ 0.70			$ 0.70	$ 0.32
Class of Warrant or Right, Issued During Period, Exercise Price
Class of Warrant or Right, Exercised During Period							(1,612,903)
Class of Warrant or Right, Exercised During Period, Exercise Price							$ 0.31
Warrant In Connection With Amended Subordinated Loan [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights								$ 0.20	$ 0.20
Class of Warrant or Right, Number of Securities Called by Warrants or Rights								625,000	625,000
Class of Warrants or Rights, Grant Date Fair Value									0.16