Note 9 - Redeemable, Convertible Preferred Stock (Details Textual)					12 Months Ended
	Feb. 26, 2024	Feb. 26, 2023	Mar. 30, 2021 USD ($) shares	Feb. 26, 2021 USD ($) $ / shares shares	Dec. 31, 2024 USD ($) Days $ / shares	Dec. 31, 2023 USD ($)	Dec. 31, 2021 USD ($) $ / shares shares	Feb. 28, 2021 shares
Redeemable Convertible Preferred Stocks [Line Items]
Preferred Stock, No Par Value (in dollars per share) | $ / shares					$ 0
Embedded Derivative, Carrying Value of Embedded Derivative Liability					$ 1,000,000	$ 2,000,000
Series A Preferred Stock [Member] | Repurchase And Exchange Agreement [Member]
Redeemable Convertible Preferred Stocks [Line Items]
Stock Repurchased During Period, Shares (in shares) | shares				1,000,000
Payments for Repurchase of Preferred Stock and Preference Stock				$ 100,641,667,000,000
Series B Preferred Stock [Member]
Redeemable Convertible Preferred Stocks [Line Items]
Preferred Stock, Dividend Rate, Percentage				4.00%
Temporary Equity, Liquidation Preference Per Share (in dollars per share) | $ / shares				$ 100
Preferred Stock, Redemption Price Per Share (in dollars per share) | $ / shares							$ 100
Preferred Stock, No Par Value (in dollars per share) | $ / shares				$ 0
Convertible Preferred Stock, Shares Issued upon Conversion (in shares) | shares								1,000,000
Temporary Equity Issuance Of Redeemable Convertible Preferred Stock Net Of Offering Costs And Derivative Liability				$ 93,000,000
Derivative Liability, Subject to Master Netting Arrangement, before Offset				1,000,000
Temporary Equity, Fair Value of Preferred Stock at Issuance				95,000,000
Debt Instrument, Convertible, Stock Price Trigger (in dollars per share) | $ / shares					$ 14.5
Series B Preferred Stock [Member] | Other Noncurrent Liabilities [Member]
Redeemable Convertible Preferred Stocks [Line Items]
Embedded Derivative, Carrying Value of Embedded Derivative Liability				$ 1,000,000	$ 1,000,000	1,000,000	$ 1,000,000
Series B Preferred Stock [Member] | Minimum [Member]
Redeemable Convertible Preferred Stocks [Line Items]
Debt Instrument, Convertible, Threshold Trading Days | Days					45
Series B Preferred Stock [Member] | Maximum [Member]
Redeemable Convertible Preferred Stocks [Line Items]
Debt Instrument, Convertible, Threshold Consecutive Trading Days | Days					60
Series B Preferred Stock [Member] | Purchase Agreement [Member]
Redeemable Convertible Preferred Stocks [Line Items]
Convertible Preferred Stock, Shares Issued upon Conversion (in shares) | shares				9.5238
Temporary Equity, Fair Value of Preferred Stock at Issuance				$ 95,000,000
Preferred Stock, Convertible, Conversion Price (in dollars per share) | $ / shares				$ 10.5
Series B Preferred Stock [Member] | Repurchase And Exchange Agreement [Member]
Redeemable Convertible Preferred Stocks [Line Items]
Preferred Stock, Dividend Rate, Percentage				4.00%
Stock Issued During Period, Shares, New Issues (in shares) | shares				1,000,000
Dividends and Interest Paid				$ 641,667
Series C Preferred Stock [Member]
Redeemable Convertible Preferred Stocks [Line Items]
Preferred Stock, Redemption Price Per Share (in dollars per share) | $ / shares				$ 100
Temporary Equity Issuance Of Redeemable Convertible Preferred Stock Net Of Offering Costs And Derivative Liability					$ 97,000,000
Derivative Liability, Subject to Master Netting Arrangement, before Offset				$ 2,000,000
Transaction Costs				1,000,000
Embedded Derivative, Carrying Value of Embedded Derivative Liability				$ 2,000,000
Series C Preferred Stock [Member] | After February Twenty Six Two Thousand Twenty Three [Member]
Redeemable Convertible Preferred Stocks [Line Items]
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger		200.00%
Series C Preferred Stock [Member] | After February Twenty Six Two Thousand Twenty Four [Member]
Redeemable Convertible Preferred Stocks [Line Items]
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger	150.00%
Series C Preferred Stock [Member] | Other Noncurrent Liabilities [Member]
Redeemable Convertible Preferred Stocks [Line Items]
Embedded Derivative, Carrying Value of Embedded Derivative Liability					$ 1,000,000	$ 1,000,000
Series C Preferred Stock [Member] | Minimum [Member]
Redeemable Convertible Preferred Stocks [Line Items]
Debt Instrument, Convertible, Threshold Trading Days | Days					45
Series C Preferred Stock [Member] | Maximum [Member]
Redeemable Convertible Preferred Stocks [Line Items]
Debt Instrument, Convertible, Threshold Consecutive Trading Days | Days					60
Series C Preferred Stock [Member] | Purchase Agreement [Member]
Redeemable Convertible Preferred Stocks [Line Items]
Temporary equity, Shares issued (in shares) | shares			250,000	750,000			100,000,000
Preferred Stock, Dividend Rate, Percentage				5.00%
Temporary Equity, Liquidation Preference Per Share (in dollars per share) | $ / shares				$ 100
Gross Proceeds From Temporary Equity Liquidation Preference Preferred Stock				$ 100,000,000
Preferred Stock, No Par Value (in dollars per share) | $ / shares				$ 0
Gross Proceeds From Issuance Of Preferred Stock And Preference Stock			$ 25,000,000	$ 75,000,000
Preferred Stock, Convertible, Conversion Price (in dollars per share) | $ / shares				$ 10
Convertible Preferred Stock, Shares Reserved for Future Issuance (in shares) | shares				1,000,000
Series C Preferred Stock [Member] | Dividend And Other Rights [Member]
Redeemable Convertible Preferred Stocks [Line Items]
Preferred Stock, Dividend Rate, Percentage				5.00%