Note 8 - Accounts Payable and Accrued Expenses (Details Textual) - USD ($)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Stock Issued During Period, Value, Issued for Services	$ 196,051
Stock Issued During Period, Value, Paid for Interest	$ 165,067
Unit Offering [Member]
Shares Issued, Price Per Share	$ 0.25
Stock Issued During Period, Share, Paid for Interest	617,072	310,404
Stock Issued During Period, Value, Paid for Interest	$ 165,067	$ 178,929
Minimum [Member] | Unit Offering [Member]
Shares Issued, Price Per Share		$ 0.53
Maximum [Member] | Unit Offering [Member]
Stock Issued During Period, Share, Paid for Interest		0.7
Officer [Member]
Stock Issued During Period, Shares, Issued for Services	323,030
Shares Issued, Price Per Share	$ 0.26
Stock Issued During Period, Value, Issued for Services	$ 83,665
Consultants [Member]
Stock Issued During Period, Shares, Issued for Services	391,406	144,545
Stock Issued During Period, Value, Issued for Services	$ 112,388	$ 82,480
Consultants [Member] | Minimum [Member]
Shares Issued, Price Per Share	$ 0.26	$ 0.50
Consultants [Member] | Maximum [Member]
Shares Issued, Price Per Share	$ 0.41	$ 0.70