Note 13 - Equity Offering - Summary of Sales Under Offering (Details) - USD ($) $ / shares in Units, $ in Thousands	6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
Net proceeds	$ 982	$ 196
The 2022 ATM Offering [Member]
Shares of common stock issued (in shares)	3,051,837
Gross proceeds	$ 1,009
Commission paid to agents	(30)
Net proceeds	$ 979
The 2022 ATM Offering [Member] | Arithmetic Average [Member]
Average price per share (in dollars per share)	$ 0.33