Note 11 - Stockholders' Equity Textual (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands			12 Months Ended
	Nov. 19, 2021	Jun. 01, 2020	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Nov. 17, 2021
Subsidiary, Sale of Stock [Line Items]
Issuance of common stock, net (in shares)		22,044		3,846	22,044
Shares issued, price per share (in dollars per share)		$ 4.50
Proceeds from issuance or sale of equity, total		$ 108,096
Sale of common stock, net			$ 0	$ 50,000	$ 93,279
Common Stock Purchase Agreement with RPI
Subsidiary, Sale of Stock [Line Items]
Issuance of common stock, net (in shares)	3,846
Shares issued, price per share (in dollars per share)	$ 13.00					$ 13.00
Sale of common stock, net	$ 50,000
Shares issued, price per share, premium (in dollars per share)						1.11
Shares issued, price per share, closing price (in dollars per share)						$ 11.89
Shares issued, common stock, premium						$ 4,269
Warrants Issued in Public Offering
Subsidiary, Sale of Stock [Line Items]
Class of warrant or right, number of securities called by warrants or rights (in shares)		3,511
Class of warrant or right, warrants issued, price per warrant (in dollars per share)		$ 4.49
Class of warrant or right, exercise price of warrants or rights (in dollars per share)		$ 0.01