Note 3 - Liquidity and Capital Resources (Details Textual) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Operating Income (Loss), Total	$ (1,831)	$ (1,574)	$ (6,095)	$ (11,668)
Net Cash Provided by (Used in) Operating Activities, Total			(4,409)	$ (6,600)
Cash and Cash Equivalents, at Carrying Value, Total	2,154		2,154		$ 7,173
Working Capital	$ 7,820		$ 7,820