Note 7 - Warrants and Registration Rights Agreements (Details Textual) - USD ($) $ / shares in Units, $ in Thousands	9 Months Ended
	Sep. 30, 2024	Mar. 31, 2024	Dec. 31, 2023	Nov. 05, 2018	Jul. 31, 2018	Feb. 06, 2018	Aug. 30, 2017	Mar. 17, 2017
Class of Warrant or Right [Line Items]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)	2,000,000		4,500,000
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)	$ 0.01		$ 0.01
Class of warrant or right, excluded from the diluted earnings (loss) per share calculation	2,000,000
Related Party November 2018 Note Payable To Great Harbor LLC [Member]
Class of Warrant or Right [Line Items]
Debt Instrument, Unamortized Discount, Total				$ 1,214
July 2018 GH Warrant [Member]
Class of Warrant or Right [Line Items]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)					2,500,000
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)					$ 0.01
Common Stock, Capital Shares Reserved for Future Issuance (in shares)					2,500,000
Debt Instrument, Unamortized Discount, Total					$ 1,479
November 2018 Great Harbor Warrant [Member]
Class of Warrant or Right [Line Items]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)				$ 0.01
Common Stock, Capital Shares Reserved for Future Issuance (in shares)				2,000,000
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares)				2,000,000
Escrow Warrants [Member]
Class of Warrant or Right [Line Items]
Class of Warrant or Right, Outstanding (in shares)	0	0
Golisano LLC March 2017 Warrant [Member]
Class of Warrant or Right [Line Items]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)								$ 0.01
Common Stock, Capital Shares Reserved for Future Issuance (in shares)								1,484,847
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares)								1,484,847
August 2017 GH Warrant [Member]
Class of Warrant or Right [Line Items]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)							$ 0.01
Common Stock, Capital Shares Reserved for Future Issuance (in shares)							1,363,636
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares)							1,363,636
Golisano LLC 2018 Warrant [Member]
Class of Warrant or Right [Line Items]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)						$ 0.01
Common Stock, Capital Shares Reserved for Future Issuance (in shares)						1,818,182
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares)						1,818,182
February 2018 GH Warrant [Member]
Class of Warrant or Right [Line Items]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)						$ 0.01
Common Stock, Capital Shares Reserved for Future Issuance (in shares)						1,818,182
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares)						1,818,182