Note 7 - Equity (Details Textual) $ / shares in Units, $ in Thousands									1 Months Ended		9 Months Ended
	Aug. 19, 2025 USD ($) $ / shares shares	May 15, 2025 USD ($) $ / shares shares	Mar. 19, 2025 USD ($) $ / shares shares	Dec. 02, 2024 USD ($) $ / shares shares	Dec. 02, 2024 USD ($) $ / shares	Nov. 29, 2024 USD ($) $ / shares shares	May 13, 2024 USD ($) $ / shares shares	Apr. 11, 2024 shares	Sep. 30, 2025 USD ($) $ / shares shares	Dec. 31, 2024 USD ($) $ / shares shares	Sep. 30, 2025 USD ($) $ / shares shares	Sep. 30, 2024 USD ($)	Oct. 01, 2024 shares	Apr. 10, 2024 shares
Common Stock, Shares, Outstanding (in shares)									29,519,002	20,022,836	29,519,002
Treasury Stock, Common, Shares (in shares)									768,595	768,595	768,595
Common Stock, Shares, Issued (in shares)									30,287,597	20,791,431	30,287,597
Share-Based Payment Arrangement, Shares Withheld for Tax Withholding Obligation (in shares)											0
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares									$ 0.0005	$ 0.0005	$ 0.0005
Proceeds from Issuance of Warrants | $											$ 19,370	$ 10,000
Payments of Stock Issuance Costs | $											865	$ 100
Treasury Stock, Common, Value | $									$ 11,407	$ 11,407	$ 11,407
Restricted Stock Units (RSUs) [Member]
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures (in shares)											368,094
Direct Offering [Member]
Stock Issued During Period, Shares, New Issues (in shares)				2,483,586							3,542,856
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares				$ 0.0005	$ 0.0005
Proceeds from Issuance of Common Stock, Gross | $				$ 5,750
Stock Issuance, Offering Costs Payable | $				$ 562	$ 562
Registered Direct Offering Through Agent [Member]
Stock Issued During Period, Shares, New Issues (in shares)				1,943,676
Stock Issued, Cash Fee, Percentage of Gross Proceeds Raised				4.00%
Stock Issued During Period, Value, New Issues | $				$ 4,500
March Purchase Agreements [Member]
Securities Purchase Agreement, Number of Shares (in shares)			2,332,104
Sale of Stock, Price Per Unit (in dollars per share) | $ / shares			$ 2.174
Proceeds from Issuance or Sale of Equity | $			$ 5,070
Payments of Stock Issuance Costs | $			$ 70
August 2025 Purchase Agreement [Member]
Stock Issued During Period, Shares, New Issues (in shares)	3,542,856
Stock Issued During Period, Value, New Issues | $	$ 3,271
Proceeds from Issuance or Sale of Equity | $	$ 10,275
Pre-funded Warrants [Member]
Stock Issued During Period, Warrants Exercise, Shares (in shares)											5,585,216
May 2024 Pre-funded Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)							2,955,084
Class of Warrant or Right, Purchase Price (in dollars per share) | $ / shares							$ 3.384
Warrants Issued, Underwriting Discounts or Commissions Paid | $							$ 0
Proceeds from Issuance of Warrants | $							10,000
Warrants Issued, Amount of Offering Expenses Payable | $							$ 100
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares							$ 0.0005
December 2024 Pre-funded Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)						1,187,802
Class of Warrant or Right, Purchase Price (in dollars per share) | $ / shares						$ 2.3147
Warrants Issued, Underwriting Discounts or Commissions Paid | $						$ 0
Proceeds from Issuance of Warrants | $					2,750
Warrants Issued, Amount of Offering Expenses Payable | $				$ 22	$ 22
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares						$ 0.0005
Class of Warrant or Right, Exercised During Period (in shares)										647,892
March Pre-Funded Warrants [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares			$ 0.0005
May 2025 Prefunded Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)		1,829,956
Class of Warrant or Right, Purchase Price (in dollars per share) | $ / shares		$ 2.1995
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares		$ 0.0005
Proceeds from Issuance of Private Placement | $		$ 2,671
May 2025 Common Stock Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)		1,829,956
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares		$ 2.2
Warrants and Rights Outstanding, Term (Year)		3 years
Proceeds from Issuance of Private Placement | $		$ 1,354
May 2025 Warrants [Member]
Warrants Issued, Underwriting Discounts or Commissions Paid | $		0
Warrants Issued, Amount of Offering Expenses Payable | $		54
Proceeds from Issuance of Private Placement | $		$ 4,025
August 2025 Pre-funded Warrants [Member]
Stock Issued During Period, Warrants Exercise, Shares (in shares)									1,657,143
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)	2,328,571
Class of Warrant or Right, Purchase Price (in dollars per share) | $ / shares	$ 1.7495
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares	$ 0.0005
Warrants and Rights Outstanding | $	$ 2,150
Class of Warrant or Right, Outstanding (in shares)	671,428
Class of Warrant or Right, Not Exercisable Until Approval (in shares)	585,714
August 2025 Common Stock Warrant [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)	5,871,427
Class of Warrant or Right, Purchase Price (in dollars per share) | $ / shares	$ 1.75
Warrants Issued, Amount of Offering Expenses Payable | $	$ 742
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares	$ 2.21
Warrants and Rights Outstanding, Term (Year)	5 years 6 months
Warrants and Rights Outstanding | $	$ 4,854
Ownership limits, Percentage, Maximum	9.99
August 2025 Common Stock Warrant [Member] | Minimum [Member]
Ownership limits, Percentage	4.99
August 2025 Common Stock Warrant [Member] | Maximum [Member]
Ownership limits, Percentage	9.99
December 2024, March 2025, And May 2025 Pre-funded Warrants [Member]
Class of Warrant or Right, Exercised During Period (in shares)											5,585,216
Common Stock Warrant [Member]
Class of Warrant or Right, Outstanding (in shares)									7,701,383	0	7,701,383
Reverse Stock Split [Member]
Stockholders' Equity Note, Stock Split, Conversion Ratio								6
Common Stock, Shares, Outstanding (in shares)								13,660,598						81,571,864
Treasury Stock, Common, Shares (in shares)								768,595					4,611,569
Common Stock, Shares, Issued (in shares)								13,660,598						81,571,864