Note 12 - Equity Offerings - Summary of Sales Under Offering (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2023	Sep. 30, 2022
Net proceeds		$ 9,946	$ 0
The 2022 ATM Offering [Member]
Shares of common stock issued (in shares)	78,600	433,672
Gross proceeds	$ 25	$ 227
Commission paid to Agents	1	7
Net proceeds	$ 24	$ 220
The 2022 ATM Offering [Member] | Arithmetic Average [Member]
Average price per share (in dollars per share)	$ 0.31	$ 0.52