Note 6 - Common Stock (Details Textual) - USD ($)										3 Months Ended				6 Months Ended
	Apr. 25, 2018	Apr. 06, 2018	Apr. 02, 2018	Apr. 01, 2018	Feb. 09, 2018	Jan. 09, 2018	Oct. 26, 2017	Sep. 30, 2016	Mar. 10, 2016	Mar. 31, 2018	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017	Dec. 26, 2017
Common Stock, Shares Authorized														100,000,000		100,000,000
Common Stock, Shares Outstanding and Reserved														40,237,547
Common Stock, Shares, Issued, Total														34,674,261		23,156,563
Common Stock, Shares Subscribed but Unissued														2,827,305
Shares Authorized During Period, Private Placement							15,000,000	10,000,000	5,000,000
Amount of Private Placement							$ 2,812,500	$ 1,875,000	$ 937,500
Proceeds from Issuance of Private Placement											$ 93,750		$ 50,625		$ 50,625
Debt Conversion, Original Debt, Amount														$ 178,125
Chief Executive Officer [Member]
Stock Issued During Period, Shares, New Issues					1,000,000
Shares Issued, Price Per Share		$ 0.1875	$ 0.1875	$ 0.1875	$ 0.1875
Common Stock, Value, Subscriptions					$ 187,500
Debt Conversion, Original Debt, Amount				$ 178,125
Debt Conversion, Converted Instrument, Shares Issued		400,000	550,000	950,000
Private Placement [Member]
Common Stock, Capital Shares Reserved for Future Issuance														2,139,034
Shares Authorized During Period, Private Placement	30,000,000
Sale of Stock, Price Per Share							$ 0.1875	$ 0.1875	$ 0.1875
Amount of Private Placement	$ 7,500,000
Stock Issued During Period, Shares, New Issues											500,000	0	270,000
Shares Issued, Price Per Share											$ 0.1875		$ 0.1875
Private Placement 2016-2 [Member]
Stock Issued During Period, Shares, New Issues										7,579,059
Shares Issued, Price Per Share										$ 0.1875
Private Placement 2016-3 [Member]
Stock Issued During Period, Shares, New Issues										1,901,941
Shares Issued, Price Per Share										$ 0.25
Subscription Agreement [Member]
Common Stock, Shares Subscribed but Unissued																	2,884,132
Stock Issued During Period, Shares, New Issues										1,901,941
Common Stock, Value, Subscriptions																	$ 721,033
Officer [Member]
Common Stock, Capital Shares Reserved for Future Issuance														144,330
Chief Executive Officer [Member]
Proceeds from Issuance of Private Placement											$ 37,500
Deferred Compensation Arrangement with Individual, Shares Issued						76,499
Chief Executive Officer [Member] | Private Placement [Member]
Stock Issued During Period, Shares, New Issues											200,000
Shares Issued, Price Per Share											$ 0.1875
Chief Financial Officer [Member]
Deferred Compensation Arrangement with Individual, Shares Issued						10,199
CEO and CFO [Member]
Shares Issued, Price Per Share						$ 0.2451
Deferred Compensation Arrangement with Individual, Fair Value of Shares Issued						$ 21,250