Note 14 - Equity Offerings (Details Textual) - USD ($) $ / shares in Units, $ in Thousands		12 Months Ended
	Jul. 27, 2023	Dec. 31, 2023	Mar. 18, 2022
Warrants Issued in Registered Direct Offering [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights	23,809,524
Class of Warrant or Right, Exercise Price of Warrants or Rights	$ 0.42
Warrants and Rights Outstanding, Term	5 years
Proceeds from Issuance of Warrants	$ 7,100
Other Nonoperating Expense	$ 700
The 2022 ATM Offering [Member]
Stock Offering Agreement, Maximum Share Value			$ 100,000
Stock Offering Agreement, Commission, Percent			3.00%
Stock Issued During Period, Shares, New Issues		933,672
Proceeds from Issuance or Sale of Equity		$ 403
Common Stock Issued in Registered Direct Offering [Member]
Stock Issued During Period, Shares, New Issues	23,809,524
Proceeds from Issuance or Sale of Equity	$ 10,000
Proceeds from Issuance of Common Stock	2,900
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs	$ 1,000