Note 8 - Stockholders' Equity (Deficit) (Details Textual)						3 Months Ended		6 Months Ended		7 Months Ended
	Jun. 10, 2024 USD ($) $ / shares shares	Jul. 24, 2023 USD ($) $ / shares shares	May 09, 2023 USD ($) $ / shares shares	Jan. 19, 2023 USD ($) $ / shares shares	Oct. 05, 2020 $ / shares shares	Jun. 30, 2024 USD ($) $ / shares shares	Jun. 30, 2023 shares	Jun. 30, 2024 USD ($) $ / shares shares	Jun. 30, 2023 USD ($) shares	Dec. 31, 2023 USD ($) $ / shares shares	Jun. 08, 2023 USD ($)
Class of Stock [Line Items]
Preferred Stock, Shares Authorized (in shares)						15,000,000		15,000,000		15,000,000
Common Stock, Shares, Outstanding (in shares)						10,363,434		10,363,434		9,451,753
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number (in shares)						429,153		429,153
Share-Based Compensation Arrangement by Share-Based Payment Award, Options and Warrants, Outstanding, Number (in shares)						866,875		866,875
Preferred Stock, Shares Issued (in shares)						0		0
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares						$ 0.01		$ 0.01		$ 0.01
Proceeds from Warrant Exercises | $								$ 0	$ 6,886,000
Common Stock, Shares Authorized (in shares)						45,000,000		45,000,000		45,000,000
Rights Agreement, Exercise Price (in dollars per share) | $ / shares					$ 100
Rights Agreement, Number of Preferred Stock Issuable Per Right (in shares)					0.001
Common Stock [Member]
Class of Stock [Line Items]
Stock Issued During Period, Shares, New Issues (in shares)						744,843	158,461	755,865	275,961
Stock Issued During Period, Shares, Warrants Exercised (in shares)							313,000		313,000
December 2022 and January 2023 Warrants [Member]
Class of Stock [Line Items]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares			$ 25
Class of Warrant or Right, Exercised During Period (in shares)			313,000
Proceeds from Warrant Exercises | $			$ 6,900,000
Stock Issued During Period, Shares, Warrants Exercised (in shares)			313,000
Fair Value Adjustment of Warrants | $			$ 383,000
December 2022 and January 2023 Warrants [Member] | Measurement Input, Risk Free Interest Rate [Member]
Class of Stock [Line Items]
Warrants and Rights Outstanding, Measurement Input			4.81
December 2022 and January 2023 Warrants [Member] | Measurement Input, Expected Term [Member]
Class of Stock [Line Items]
Warrants and Rights Outstanding, Measurement Input			1
December 2022 and January 2023 Warrants [Member] | Measurement Input, Price Volatility [Member]
Class of Stock [Line Items]
Warrants and Rights Outstanding, Measurement Input			42.5
December 2022 and January 2023 Warrants [Member] | Measurement Input, Expected Dividend Rate [Member]
Class of Stock [Line Items]
Warrants and Rights Outstanding, Measurement Input			0
Modified Warrants [Member]
Class of Stock [Line Items]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares			$ 22
New Warrants [Member]
Class of Stock [Line Items]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares			$ 30
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)			313,000
New Warrants [Member] | Measurement Input, Risk Free Interest Rate [Member] | Fair Value, Inputs, Level 2 [Member]
Class of Stock [Line Items]
Warrants and Rights Outstanding, Measurement Input			4.81
New Warrants [Member] | Measurement Input, Expected Term [Member] | Fair Value, Inputs, Level 2 [Member]
Class of Stock [Line Items]
Warrants and Rights Outstanding, Measurement Input			1.5
New Warrants [Member] | Measurement Input, Price Volatility [Member] | Fair Value, Inputs, Level 2 [Member]
Class of Stock [Line Items]
Warrants and Rights Outstanding, Measurement Input			43.7
New Warrants [Member] | Measurement Input, Expected Dividend Rate [Member] | Fair Value, Inputs, Level 2 [Member]
Class of Stock [Line Items]
Warrants and Rights Outstanding, Measurement Input			0
Person or Group [Member]
Class of Stock [Line Items]
Rights Agreement, Beneficial Ownership Percentage of Common Stock,Threshold					18.00%
Certain Passive Investors [Member]
Class of Stock [Line Items]
Rights Agreement, Beneficial Ownership Percentage of Common Stock,Threshold					20.00%
Underwritten Public Offering [Member]
Class of Stock [Line Items]
Stock Issued During Period, Shares, New Issues (in shares)	731,750	1,600,000
Warrant exercise price | $ / shares	$ 26
Warrants exercisable term	36 months
Shares Issued, Price Per Share (in dollars per share) | $ / shares	$ 20.5	$ 17.77				$ 19.37		$ 19.37
Underwriting Agreement, Discount Percentage		6.50%				5.50%		5.50%
Proceeds from Issuance of Common Stock, Net | $	$ 13,700,000	$ 28,200,000
Underwritten Public Offering [Member] | Common Stock [Member]
Class of Stock [Line Items]
Shares Issued, Price Per Share (in dollars per share) | $ / shares		$ 19
Underwritten Public Offering [Member] | Measurement Input, Risk Free Interest Rate [Member] | Fair Value, Inputs, Level 2 [Member]
Class of Stock [Line Items]
Warrants and Rights Outstanding, Measurement Input	4.57
Underwritten Public Offering [Member] | Measurement Input, Expected Term [Member] | Fair Value, Inputs, Level 2 [Member]
Class of Stock [Line Items]
Warrants and Rights Outstanding, Measurement Input	3
Underwritten Public Offering [Member] | Measurement Input, Price Volatility [Member] | Fair Value, Inputs, Level 2 [Member]
Class of Stock [Line Items]
Warrants and Rights Outstanding, Measurement Input	57
Underwritten Public Offering [Member] | Measurement Input, Expected Dividend Rate [Member] | Fair Value, Inputs, Level 2 [Member]
Class of Stock [Line Items]
Warrants and Rights Outstanding, Measurement Input	0
Sales Agreement [Member]
Class of Stock [Line Items]
Stock Issued During Period, Shares, New Issues (in shares)								24,115		211,376
Proceeds from Issuance of Common Stock, Net | $								$ 500,000		$ 5,200,000
Sales Agreement [Member] | Common Stock [Member]
Class of Stock [Line Items]
Balance remaining from sales agreement | $						$ 34,300,000		$ 34,300,000
Sales Agreement [Member] | Cantor Fitzgerald & Co. [Member]
Class of Stock [Line Items]
Offering Agreement, Maximum Aggregate Common Shares May be Offered | $											$ 40,000,000
Commission Fee, Percentage of Gross Proceeds of Shares Sold, Maximum											2.75%
Private Placement [Member]
Class of Stock [Line Items]
Stock Issued During Period, Shares, New Issues (in shares)				117,500
Rights Agreement, Exercise Price (in dollars per share) | $ / shares				$ 25
Proceeds from Issuance of Common Stock, Net | $				$ 2,300,000
Private Placement [Member] | January 2023 Warrants [Member]
Class of Stock [Line Items]
Shares Issued, Price Per Share (in dollars per share) | $ / shares				$ 20
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares				$ 25
Restricted Stock [Member]
Class of Stock [Line Items]
Common Stock, Shares, Outstanding (in shares)						10,363,434		10,363,434
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number (in shares)						429,153	429,376	429,153	429,376	433,528