Note 11 - Commitments and Contingencies (Details Textual)	3 Months Ended
	Mar. 31, 2019 USD ($)
Operating Lease, Expense	$ 12,900
Operating Lease, Weighted Average Remaining Lease Term	1 year 255 days
Operating Lease, Weighted Average Discount Rate, Percent	12.00%
Lessee, Operating Lease, Liability, Payments, Remainder of Fiscal Year	$ 44,000
Lessee, Operating Lease, Liability, Payments, Due Year Two	44,000
Lessee, Operating Lease, Liability, Payments, Due Year Three	12,000
Lessee, Operating Lease, Liability, Undiscounted Excess Amount	12,000
Operating Lease, Payments	$ 14,600