Note 12 - Stockholders' (Deficit) Equity (Details Textual) $ / shares in Units, $ in Millions							1 Months Ended	3 Months Ended
	May 30, 2024	Mar. 27, 2024 shares	Dec. 21, 2023 USD ($) $ / shares	Apr. 27, 2023 USD ($) $ / shares	Sep. 09, 2022 USD ($) $ / shares shares	Oct. 29, 2021 shares	Mar. 31, 2024 USD ($) $ / shares	Jun. 30, 2024 $ / shares shares	May 27, 2024	Jan. 29, 2024 $ / shares	Dec. 31, 2023 shares	Jun. 30, 2023 $ / shares shares
Common Stock, Shares Authorized (in shares)								150,000,000			150,000,000
Preferred Stock, Shares Authorized (in shares)								5,000,000			5,000,000
Preferred Stock, Convertible, Shares Issuable (in shares)								1,000
Preferred Stock, Shares Outstanding (in shares)								0			1
May 2023 Warrants [Member]
Preferred Stock, Convertible, Conversion Price (in dollars per share) | $ / shares				$ 45.5
Series B Preferred Stock [Member]
Preferred Stock, Shares Outstanding (in shares)								1,000			6,000
Preferred Stock, Convertible, Conversion Price (in dollars per share) | $ / shares				$ 220.5						$ 8.75
Preferred Stock, Change in Conversion Price, Income Statement Impact | $			$ 4.5		$ 5.7
Series B Preferred Stock [Member] | Minimum [Member]
Preferred Stock, Convertible, Conversion Ratio										75
Series B Preferred Stock [Member] | Previously Reported [Member]
Preferred Stock, Convertible, Conversion Price (in dollars per share) | $ / shares			$ 45.5		$ 490
Series B Preferred Stock [Member] | Revision of Prior Period, Adjustment [Member]
Preferred Stock, Convertible, Conversion Price (in dollars per share) | $ / shares			$ 8.75		$ 220.5
Series B Preferred Stock [Member] | The 2021 Private Placement Program [Member]
Preferred Stock, Convertible, Shares Issuable (in shares)								15,065				201,432
Stock Issued During Period, Shares, New Issues (in shares)						15,000
Preferred Stock, Shares Outstanding (in shares)								131				9,156
Preferred Stock, Convertible, Conversion Price (in dollars per share) | $ / shares								$ 8.75				$ 45.5
Series B Preferred Stock [Member] | The 2023 Private Placement [Member]
Preferred Stock, Change in Conversion Price, Income Statement Impact | $				$ 1.8
Series C Preferred Stock [Member]
Stock Issued During Period, Shares, New Issues (in shares)		3,250
Preferred Stock, Convertible, Conversion Price (in dollars per share) | $ / shares				$ 220.5
Preferred Stock, Change in Conversion Price, Income Statement Impact | $			$ 0.5				$ 0.4
Series C Preferred Stock [Member] | Minimum [Member]
Preferred Stock, Convertible, Conversion Ratio									75
Series C Preferred Stock [Member] | Previously Reported [Member]
Preferred Stock, Convertible, Conversion Price (in dollars per share) | $ / shares			$ 45.5				$ 8.75
Series C Preferred Stock [Member] | Revision of Prior Period, Adjustment [Member]
Preferred Stock, Convertible, Conversion Price (in dollars per share) | $ / shares			$ 8.75				$ 4.9
Series C Preferred Stock [Member] | The 2023 Private Placement [Member]
Preferred Stock, Change in Conversion Price, Income Statement Impact | $				$ 194.0
Series C Preferred Stock [Member] | The 2022 Private Placement [Member]
Preferred Stock, Convertible, Shares Issuable (in shares)												24,134
Stock Issued During Period, Shares, New Issues (in shares)					3,250
Preferred Stock, Shares Outstanding (in shares)								0				1,097
Preferred Stock, Convertible, Conversion Price (in dollars per share) | $ / shares												$ 45.5
Reverse Stock Split [Member]
Stockholders' Equity Note, Stock Split, Conversion Ratio	35							35