Note 3 - Summary of Significant Accounting Policies (Details Textual) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Net Income (Loss) Attributable to Parent, Total	$ (2,310)	$ (1,138)
Cash and Cash Equivalents, at Carrying Value, Ending Balance	1,555	1,600	$ 1,603
Research and Development Expense, Total	214	201
Operating Lease, Right-of-Use Asset	9		$ 12
Operating Lease, Cost	50	$ 90
Short-term Lease, Cost	40
Other Current Assets [Member]
Operating Lease, Right-of-Use Asset	10
Other Current Liabilities [Member]
Operating Lease, Liability, Total	$ 10