Note 5 - Redeemable, Convertible Preferred Stock (Details Textual)				3 Months Ended
	Feb. 26, 2024	Feb. 26, 2023	Feb. 26, 2021 USD ($) $ / shares shares	Mar. 31, 2025 USD ($) Days $ / shares	Dec. 31, 2024 USD ($)
Preferred Stock, No Par Value (in dollars per share)				$ 0
Series B Preferred Stock [Member]
Preferred Stock, Dividend Rate, Percentage			4.00%
Preferred Stock, No Par Value (in dollars per share)			$ 0
Temporary Equity, Fair Value of Preferred Stock at Issuance | $			$ 95,000,000
Temporary Equity, Liquidation Preference Per Share (in dollars per share)			$ 100
Debt Instrument, Convertible, Stock Price Trigger (in dollars per share)				$ 14.5
Embedded Derivative, Fair Value of Embedded Derivative Liability | $			$ 1,000,000
Series B Preferred Stock [Member] | Minimum [Member]
Temporary Equity, Convertible, Threshold Trading Days (Day)				45 days
Series B Preferred Stock [Member] | Maximum [Member]
Temporary Equity, Convertible, Threshold Trading Days (Day)				60 days
Embedded Derivative, Fair Value of Embedded Derivative Liability | $				$ 1,000,000	$ 1,000,000
Series C Preferred Stock [Member]
Embedded Derivative, Fair Value of Embedded Derivative Liability | $			$ 2,000,000
Series C Preferred Stock [Member] | After February Twenty Six Two Thousand Twenty Four [Member]
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger		200.00%
Temporary Equity, Convertible, Threshold Percentage of Stock Price Trigger	150.00%
Series C Preferred Stock [Member] | Minimum [Member]
Debt Instrument, Convertible, Threshold Trading Days | Days				45
Series C Preferred Stock [Member] | Minimum [Member] | Other Noncurrent Liabilities [Member]
Embedded Derivative, Fair Value of Embedded Derivative Liability | $				$ 1,000,000
Series C Preferred Stock [Member] | Maximum [Member]
Debt Instrument, Convertible, Threshold Consecutive Trading Days | Days				60
Repurchase And Exchange Agreement [Member] | Series A Preferred Stock [Member]
Stock Repurchased During Period, Shares (in shares) | shares			1,000,000
Repurchase And Exchange Agreement [Member] | Series B Preferred Stock [Member]
Preferred Stock, Dividend Rate, Percentage			4.00%
Purchase Agreement [Member] | Series B Preferred Stock [Member]
Convertible Preferred Stock, Share Conversion, Rate (in shares) | shares			9.5238
Preferred Stock, Convertible, Conversion Price (in dollars per share)			$ 10.5
Purchase Agreement [Member] | Series C Preferred Stock [Member]
Preferred Stock, Dividend Rate, Percentage			5.00%
Preferred Stock, No Par Value (in dollars per share)			$ 0
Temporary Equity, Liquidation Preference Per Share (in dollars per share)			100
Preferred Stock, Convertible, Conversion Price (in dollars per share)			$ 10
Stock Issued During Period, Shares, New Issues (in shares) | shares			1,000,000
Shares Issued, Price Per Share (in dollars per share)			$ 100
Proceeds from Issuance or Sale of Equity | $			$ 100,000,000
Dividend And Other Rights [Member] | Series C Preferred Stock [Member]
Preferred Stock, Dividend Rate, Percentage			5.00%