Note 2 - Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2022

Accounting Policies [Abstract]

Schedule of Calculation of Weighted Average Shares Used to Calculate Basic and Diluted Loss Per Share

The following table presents the calculation of weighted average shares used to calculate basic and diluted loss per share (in thousands, except share and per share amounts):

	Year Ended December 31,
	2022			2021
Basic net loss per common share:
Net loss	$	(14,260	)	$	(26,616	)
Adjustment to record the impact of exercise price reset on outstanding warrants related to down round provisions		(288	)		—
Net loss attributable to common shares - basic	$	(14,548	)	$	(26,616	)
Weighted average shares used in calculating basic loss per share		880,311			186,195
Basic net loss per common share	$	(16.53	)	$	(142.95	)
Diluted net loss per common share:
Net loss	$	(14,260	)	$	(26,616	)
Change in fair value of warrants		—			(5,119	)
Adjustment to record the impact of exercise price reset on outstanding warrants related to down round provisions		(288	)		—
Net loss attributable to common shares - diluted	$	(14,548	)	$	(31,735	)
Weighted-average shares outstanding		880,311			186,195
Effect of potentially dilutive securities		—			763
Weighted average shares used in calculating diluted loss per share		880,311			186,958
Diluted net loss per common share	$	(16.53	)	$	(169.74	)

Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share

The following potentially dilutive securities were excluded from the calculation of diluted loss per share because their effects would be anti-dilutive:

	December 31,
	2022		2021
Stock options		43,658		39,048
Warrants for common stock		1,055,672		143,602
Series A Convertible Preferred Stock		129		129
Total		1,099,459		182,779