Note 1 - Organization and Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2023

Notes Tables

Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]

	December 31,
	2023		2022		2021
Unvested restricted stock		8,139,037		7,232,254		10,532,029
Options		4,697,029		5,135,685		2,467,537
Warrants		312,272		262,100		262,100
Shares issuable upon note conversion		20,902		20,619		18,942
Total		13,169,240		12,650,658		13,280,608

Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]

	Year ended
	December 31,
(in thousands, except share and per share data)	2023		2022			2021
Net income (loss)		12,672		(198,335	)		(348,101	)
Weighted-average common shares outstanding		141,955,112		135,411,258			132,222,753
Dilutive effect of potential common shares		6,553,353		-			-
Weighted-average common shares outstanding assuming dilution		148,508,465		135,411,258			132,222,753
Net income (loss) per share - basic		0.09		(1.46	)		(2.63	)
Net income (loss) per share - diluted		0.09		(1.46	)		(2.63	)