Note 2 - Risks and Uncertainties (Details Textual) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021	Dec. 31, 2020
Retained Earnings (Accumulated Deficit), Total	$ (59,827)		$ (56,161)
Net Income (Loss) Attributable to Parent, Total	(3,666)	$ (2,257)
Net Cash Provided by (Used in) Operating Activities, Total	(4,483)	(1,965)
Cash and Cash Equivalents, at Carrying Value, Total	7,386		11,867
Working Capital	3,400
Stockholders' Equity Attributable to Parent, Ending Balance	$ 6,581	$ 7,584	$ 10,212	$ 8,448