Note 12 - Quarterly Financial Information (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2020

Notes Tables

Quarterly Financial Information [Table Text Block]

	First			Second			Third			Fourth
2020 Quarters
Revenues	$	4,823		$	2,871		$	6,102		$	4,016
Net Loss		(37,599	)		(38,607	)		(46,115	)		(60,493	)
Basic and diluted net loss per share		(0.24	)		(0.24	)		(0.26	)		(0.34	)
2019 Quarters
Revenues	$	5,887		$	1,448		$	1,775		$	39,725
Net Loss		(31,054	)		(37,629	)		(37,592	)		(2,622	)
Basic and diluted net loss per share		(0.28	)		(0.34	)		(0.34	)		(0.02	)