Note 12 - Commitments and Contingencies (Details Textual) - USD ($)	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Operating Lease, Expense	$ 13,300	$ 12,900
Operating Lease, Weighted Average Remaining Lease Term (Month)	270 days
Operating Lease, Weighted Average Discount Rate, Percent	12.00%
Lessee, Operating Lease, Liability, to be Paid, Remainder of Fiscal Year	$ 29,500
Lessee, Operating Lease, Liability, to be Paid, Year Two	12,400
Lessee, Operating Lease, Liability, Undiscounted Excess Amount	4,500	12,900
Operating Lease, Payments	$ 14,700	$ 14,600