Note 14 - Common Stock (Details Textual) - USD ($) $ / shares in Units, $ in Thousands					12 Months Ended		144 Months Ended
	Aug. 19, 2024	Apr. 15, 2024	Apr. 12, 2023	Apr. 12, 2023	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2024	Dec. 31, 2013
Common Stock, Shares Authorized (in shares)					60,000,000	60,000,000	60,000,000
Common Stock, Capital Shares Reserved for Future Issuance (in shares)					38,796,922		38,796,922
Proceeds from Issuance of Common Stock					$ 6,482	$ 5,992
Employee Stock Purchase Plan [Member]
Equity Plan, ESPP, Percent of Market Value								85.00%
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares)								7,500
Share-Based Compensation Arrangement by Share-Based Payment Award, Shares Issued in Period (in shares)							4,534
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares)					2,966		2,966
Private Placement [Member]
Stock Issued During Period, Shares, New Issues (in shares)	1,388,888	367,767
Proceeds from Issuance of Common Stock	$ 5,000	$ 1,500
Shares Issued, Price Per Share (in dollars per share)	$ 3.6	$ 4.03
Sale of Stock, Minimum Percentage of Voting Power	35.00%
Securities Purchase Agreements [Member]
Stock Issued During Period, Shares, New Issues (in shares)				1,000,967
Proceeds from Issuance of Common Stock			$ 6,000	$ 6,000
Shares Issued, Price Per Share (in dollars per share)			$ 6	$ 6