Note 3 - Summary of Significant Accounting Policies (Details Textual) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Net Income (Loss) Attributable to Parent, Total	$ (968,000)	$ (379,000)	$ (3,278,000)	$ (1,517,000)
Cash and Cash Equivalents, at Carrying Value, Ending Balance	1,055,000		1,055,000		$ 1,603,000
Research and Development Expense, Total	116,000	159,000	330,000	360,000
Operating Lease, Right-of-Use Asset	7,000		7,000		$ 12,000
Operating Lease, Cost	38,000	132,000	84,000	218,000
Short-term Lease, Cost	35,000	$ 130,000	79,000	$ 130,000
Other Current Assets [Member]
Operating Lease, Right-of-Use Asset	10,000		10,000
Other Current Liabilities [Member]
Operating Lease, Liability, Total	$ 0		$ 0