Note 6 - Warrants (Details Textual) - USD ($)				3 Months Ended			6 Months Ended	9 Months Ended		12 Months Ended
	Sep. 14, 2018	Feb. 22, 2018	Feb. 12, 2018	Sep. 30, 2018	Mar. 31, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2018	Sep. 30, 2017	Jul. 17, 2017	Sep. 19, 2018	Sep. 12, 2018	Sep. 01, 2018	Feb. 21, 2018	Dec. 11, 2017	Dec. 10, 2017	Dec. 30, 2016	Jul. 08, 2016
Interest Expense, Total				$ 265,632		$ 848,735		$ 2,826,839	$ 2,921,564
Proceeds from Adjustment of Warrant							$ 148,854	$ 148,854
Class of Warrant or Right, Issued During Period								6,451,013	2,499,933
Shares Issued, Price Per Share				$ 0.25			$ 0.25	$ 0.25
Deemed Dividends								$ 297,439	$ 299,111
Lincoln Park Capital Fund, LLC [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights		1,198,784
Class of Warrant or Right, Exercise Price of Warrants or Rights		$ 0.25												$ 0.394	$ 0.394
Shares Issued, Price Per Share		$ 0.25
Deemed Dividends		$ 297,439
Warrants Issued Concurrently with Convertible Notes [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights											1,987,500
Class of Warrant or Right, Exercise Price of Warrants or Rights											$ 0.25
Warrants and Rights Outstanding											$ 217,394
Extension of Convertible Note Maturity Date, Vista Capital [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights												1,812,000
Class of Warrant or Right, Exercise Price of Warrants or Rights												$ 0.25
Interest Expense, Total				$ 488,334
Warrants, Exercise Price Reduced [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights				4,326,358			4,326,358	4,326,358
Class of Warrant or Right, Exercise Price of Warrants or Rights				$ 0.30			$ 0.30	$ 0.30
Warrants Issued Concurrently to the Spring 2018 Unit Offering [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights				400,000	333,333		400,000	400,000					333,333
Class of Warrant or Right, Exercise Price of Warrants or Rights	$ 0.25			$ 0.40	$ 0.48		$ 0.40	$ 0.40					$ 0.48
Discount On Convertible Note Payable				$ 17,373	$ 49,306		$ 17,373	$ 17,373
Class of Warrant or Right, Exercise Period Condition, Number of Trading Days Common Stock Closes at or above 2 Times the Exercise Price					30 days
Warrant Subject to Call provision, Threshold Consecutive Trading Days					10 days
Class of Warrant or Right, Issued During Period	67,777
Warrants Issued Concurrently with Line of Credit [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights				430,000			430,000	430,000
Discount On Convertible Note Payable				$ 97,966			$ 97,966	$ 97,966
Class of Warrant or Right, Exercise Period Condition, Number of Trading Days Common Stock Closes at or above 2 Times the Exercise Price					30 days
Warrant Subject to Call provision, Threshold Consecutive Trading Days					10 days
Warrants Issued Concurrently with Line of Credit, Exercise Price One [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights				390,000			390,000	390,000
Class of Warrant or Right, Exercise Price of Warrants or Rights				$ 0.35			$ 0.35	$ 0.35
Warrants Issued Concurrently with Line of Credit, Exercise Price Two [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights				40,000			40,000	40,000
Class of Warrant or Right, Exercise Price of Warrants or Rights				$ 0.25			$ 0.25	$ 0.25
Warrants Issued Concurrently with Note Payable [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights					150,000
Class of Warrant or Right, Exercise Price of Warrants or Rights					$ 0.35
Warrants Vested Monthly Contingent That Outstanding Note Payable is Present					6,250
Minimum Number of Warrants Vested For the Life of the Outstanding Note Payable					25,000
Minimum Number of Warrants Vested For the Life of the Outstanding Note Payable, Fair Value Amount					$ 6,500
Warrants Issued Concurrently to the Summer 2017 Unit Offering [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights			$ 0.30
Discount On Convertible Note Payable			$ 103,322
Class of Warrant or Right, Issued During Period			416,478		266,667
Proceeds from Convertible Debt					$ 80,000
Warrants Issued Concurrently With One Year Convertible Note [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights															2,081,216	1,200,000
Class of Warrant or Right, Exercise Price of Warrants or Rights										$ 0.65					$ 0.394		$ 0.70	$ 0.65
Class of Warrant or Right, Issued During Period										400,000
Proceeds from Convertible Debt										$ 250,000
Warrant Term										5 years