Note 2 - Risks and Uncertainties (Details Textual) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020	Dec. 31, 2019
Retained Earnings (Accumulated Deficit), Ending Balance	$ (48,283)		$ (46,026)
Net Income (Loss) Attributable to Parent, Total	(2,257)	$ (1,798)
Net Cash Provided by (Used in) Operating Activities, Total	(1,965)	(1,120)
Cash and Cash Equivalents, at Carrying Value, Ending Balance	8,098		9,022
Working Capital	7,500
Stockholders' Equity Attributable to Parent, Ending Balance	$ 7,584	$ 724	$ 8,448	$ 1,385