Note 11 - Equity Offerings (Details Textual) $ / shares in Units, $ in Thousands				3 Months Ended
	Oct. 25, 2024 USD ($) $ / shares shares	Sep. 03, 2024 USD ($) $ / shares shares	Aug. 30, 2024 shares	Mar. 31, 2025 USD ($) $ / shares shares	Dec. 31, 2024 USD ($)	Oct. 24, 2024 $ / shares
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares
Class of Warrant or Right, Exercised in Period (in shares)				939,000
Deemed Dividend on Warrant Inducement Offer | $	$ 5,200
Accrued Liabilities, Current | $				$ 1,630	$ 1,548
Weighted Average [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares				$ 2.2
Abeyance Shares [Member]
Common Stock, Capital Shares Reserved for Future Issuance (in shares)				2,157,000
September 2024 Pre-Funded Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)		2,773,000
September 2024 Pre-Funded Warrants [Member] | Pre-Funded Units [Member]
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares)		1
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares		$ 0.0001
Units Issued, Warrants Per Unit		1
Series H Warrants [Member]
Class of Warrant or Right, Exercised in Period (in shares)	1,990,000
Series H Warrants [Member] | Underwriting Agreement [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)			458,623
Class of Warrant or Right, Maximum Additional for Option (in shares)		468,041
Series H Warrants [Member] | Common Stock Units [Member]
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares)		1
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares		$ 1
Warrants and Rights Outstanding, Term (Month)		6 months
Series H Warrants [Member] | Pre-Funded Units [Member]
Units Issued, Warrants Per Unit		1
Series I Warrants [Member]
Class of Warrant or Right, Exercised in Period (in shares)	2,325,000
Series I Warrants [Member] | Underwriting Agreement [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)			458,623
Class of Warrant or Right, Maximum Additional for Option (in shares)		468,041
Series I Warrants [Member] | Common Stock Units [Member]
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares)		1
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares		$ 1
Warrants and Rights Outstanding, Term (Month)		18 months
Series I Warrants [Member] | Pre-Funded Units [Member]
Units Issued, Warrants Per Unit		1
Series J Warrants [Member] | Underwriting Agreement [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)			458,623
Class of Warrant or Right, Maximum Additional for Option (in shares)		468,041
Series J Warrants [Member] | Common Stock Units [Member]
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares)		1
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares		$ 1
Warrants and Rights Outstanding, Term (Month)		5 years
Series J Warrants [Member] | Pre-Funded Units [Member]
Units Issued, Warrants Per Unit		1
September 2024 Representative Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)		214,734
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares)		1
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares		$ 1.55		$ 1.55
Warrants and Rights Outstanding, Term (Month)		5 years
Class of Warrant or Right, Percentage of Outstanding Stock		6.00%
Maximum Beneficial Ownership		4.99%
Maximum Beneficial Ownership, With Notice		9.99%
Class of Warrant or Right, Exercisable Period (Month)		6 months
Series Warrants [Member]
Maximum Beneficial Ownership		4.99%
Maximum Beneficial Ownership, With Notice		9.99%
Maximum Beneficial Ownership, Sixty One Days Notice		19.99%
Prefunded Warrants [Member]
Maximum Beneficial Ownership, With Notice		9.99%
Existing Warrants [Member]
Stock Issued During Period, Shares, Warrant Exercises (in shares)	5,347,981
Class of Warrant or Right, Exercised During Period, Exercise Price (in dollars per share) | $ / shares	$ 0.7
Proceeds from Warrant Exercises | $	$ 3,700
Payments of Costs Related to Exercise of Warrants | $	$ 400
Existing Warrants [Member] | Minimum [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares						$ 1
Existing Warrants [Member] | Maximum [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares						$ 40
Series E Warrants [Member]
Class of Warrant or Right, Exercised in Period (in shares)	33,160.8
Series F Warrants [Member]
Class of Warrant or Right, Exercised in Period (in shares)	499,909.34
Series G Warrants [Member]
Class of Warrant or Right, Exercised in Period (in shares)	499,909.34
Series K Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)	10,695,962
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares	$ 0.7
Warrants and Rights Outstanding, Term (Month)	5 years 6 months
October 2024 Placement Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)	320,879
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares	$ 1.085			$ 1.09
Class of Warrant or Right, Exercisable Period (Month)	6 months
September 2024 Public Offering [Member]
Stock Issued During Period, Shares, New Issues (in shares)		805,900
Proceeds from Issuance Initial Public Offering | $		$ 3,600
Payments of Stock Issuance Costs | $		1,000
Proceeds From Issuance or Sale of Equity, Net | $		$ 2,600
September 2024 Public Offering [Member] | Common Stock Units [Member]
Stock Issued During Period, Shares, New Issues (in shares)		805,900
Class of Unit, Price per Unit (in dollars per share) | $ / shares		$ 1
Units Issued, Shares Per Unit		1
September 2024 Public Offering [Member] | Pre-Funded Units [Member]
Class of Unit, Price per Unit (in dollars per share) | $ / shares		$ 0.9999
Over-Allotment Option [Member] | Underwriting Agreement [Member]
Stock Issued During Period, Shares, New Issues (in shares)			458,623
Option, Period (Day)		45 days
Option, Maximum Additional Shares (in shares)		468,041
Over-Allotment Option [Member] | Common Stock Units [Member] | Underwriting Agreement [Member]
Stock Issued During Period, Shares, New Issues (in shares)			458,623
The 2022 Offering [Member]
Accrued Liabilities, Current | $				$ 1,400	$ 1,400