Note 7 - Accounts Payable and Accrued Expenses (Details Textual) - USD ($)				9 Months Ended
	Sep. 28, 2018	Jun. 29, 2018	Mar. 31, 2018	Sep. 30, 2018	Sep. 30, 2017
Shares Issued, Price Per Share				$ 0.25
Stock Issued During Period, Value, Issued for Services				$ 644,898
Unit Offering [Member]
Stock Issued During Period, Shares, Issued for Services				2,002,868	1,034,762
Stock Issued During Period, Value, Issued for Services				$ 514,959	$ 507,621
Minimum [Member] | Unit Offering [Member]
Shares Issued, Price Per Share				$ 0.31	$ 0.41
Maximum [Member] | Unit Offering [Member]
Shares Issued, Price Per Share				$ 0.42	$ 0.70
Officer [Member]
Stock Issued During Period, Shares, Issued for Services	249,258	176,947	323,030
Shares Issued, Price Per Share	$ 0.27	$ 0.43	$ 0.26
Stock Issued During Period, Value, Issued for Services	$ 67,300	$ 75,968	$ 83,665
Consultants [Member]
Stock Issued During Period, Shares, Issued for Services				1,390,813	480,625
Stock Issued During Period, Value, Issued for Services				$ 417,965	$ 252,317
Consultants [Member] | Minimum [Member]
Shares Issued, Price Per Share				$ 0.23	$ 0.43
Consultants [Member] | Maximum [Member]
Shares Issued, Price Per Share				$ 0.41	$ 0.52