Note 7 - Convertible Debt (Details Textual) - USD ($)	3 Months Ended	12 Months Ended
	Jun. 30, 2018	Dec. 31, 2018	Dec. 31, 2017
Repayments of Convertible Debt		$ 550,000	$ 1,880,000
Interest Paid, Excluding Capitalized Interest, Operating Activities		40,142	112,800
Convertible Debt, Total		0
Interest Expense, Total		$ 3,000	100,000
Interest Payable			$ 37,000
Convertible Note, Series B [Member]
Repayments of Convertible Debt	$ 600,000
Interest Paid, Excluding Capitalized Interest, Operating Activities	$ 40,000