Note 2 - Basis of Presentation (Details Textual) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021	Dec. 31, 2020
Net Income (Loss) Attributable to Parent, Total	$ (4,307)	$ 310
Net Cash Provided by (Used in) Operating Activities, Total	(2,327)	350
Cash and Cash Equivalents, at Carrying Value, Total	3,792	$ 11,218	$ 7,315	$ 10,803
Retained Earnings (Accumulated Deficit), Total	$ (359,731)		$ (355,424)