Note 12 - Equity Offerings - Summary of Sales Under Offering (Details) - USD ($) $ / shares in Units, $ in Thousands	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Net proceeds	$ 196	$ 0
The 2022 ATM Offering [Member]
Shares of common stock issued (in shares)	355,072	355,072
Gross proceeds	$ 202	$ 202
Commission paid to Agents	6	6
Net proceeds	$ 196	$ 196
The 2022 ATM Offering [Member] | Arithmetic Average [Member]
Average price per share (in dollars per share)	$ 0.57	$ 0.57