Note 10 - Convertible Notes - Related Party (Details Textual)		3 Months Ended		6 Months Ended
	Aug. 19, 2019 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Dec. 31, 2018 USD ($)
Interest Expense, Related Party		$ 114,226	$ 105,292	$ 227,439	$ 209,578
Convertible Debt Payable to Related Party [Member]
Interest Payable, Related Party		707,781		707,781		$ 588,854
Interest Expense, Related Party		$ 59,798	$ 61,925	$ 118,927	$ 123,169
Debt Instrument, Convertible, Number of Equity Instruments				1,599,176
Convertible Debt Payable to Related Party [Member] | Subsequent Event [Member]
Convertible Debt, Total	$ 926,368
Convertible Debt to Related Party in Default [Member] | Subsequent Event [Member]
Debt Instrument, Convertible, Number of Equity Instruments	578,980