Note 7 - Capital Stock - Issuance of Common Stock (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended						6 Months Ended	12 Months Ended
	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2023	Dec. 31, 2022
Price per share (in dollars per share)			$ 10.45					$ 10.45
Issuance of common stock pursuant to public offerings, net (in shares)			3,885,048				7,447,953,000	3,885,048,000
Issuance of common stock pursuant to public offerings, net	$ 47,355	$ 31,657	$ 40,580				$ 79,012	$ 40,580
At the Market Offering Program [Member]
Price per share (in dollars per share)	$ 9.95	$ 11.77		$ 0	$ 0	$ 0	$ 9.95
Issuance of common stock pursuant to public offerings, net (in shares)	4,757,953,000	2,690,000,000		0	0	0
Issuance of common stock pursuant to public offerings, net	$ 47,355	$ 31,657		$ 0	$ 0	$ 0