Note 7 - Commitments and Contingencies (Details Textual) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019	Jan. 01, 2019
Lessee, Operating Lease, Remaining Lease Term (Year)	1 year 292 days		1 year 292 days
Operating Lease, Liability, Current	$ 109,808		$ 109,808		$ 111,477	$ 100,000
Operating Lease, Liability, Noncurrent	$ 85,071		$ 85,071		$ 135,566	$ 200,000
Lessee, Operating Lease, Discount Rate	10.00%		10.00%
Lessee, Operating Lease, Renewal Term (Year)	5 years		5 years
Operating Lease, Expense	$ 30,000	$ 30,000	$ 60,000	$ 50,000
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent			90.00%
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay			4.00%
Defined Contribution Plan, Employer Discretionary Contribution Amount	$ 14,000	$ 20,000	$ 31,000	$ 38,000