Note 8 - Preferred Stock and Common Stock Warrants (Details Textual) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		1 Months Ended	3 Months Ended		6 Months Ended	9 Months Ended
	Oct. 17, 2022	Mar. 31, 2022	Sep. 30, 2022	Sep. 30, 2021	Jun. 30, 2022	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Gain (Loss) on Revaluation of Warrants			$ (2,773)	$ 4,442		$ (7,192)	$ (2,363)
Series A Convertible Preferred Stock [Member]
Temporary Equity, Shares Outstanding (in shares)			80,516			80,516		73,713
Temporary Equity, Par or Stated Value Per Share (in dollars per share)								$ 0.0001
Preferred Stock, Convertible, Conversion Price (in dollars per share)			$ 5.48			$ 5.48
Series B Convertible Preferred Stock [Member]
Temporary Equity, Shares Outstanding (in shares)			76,922			76,922		70,433
Temporary Equity, Par or Stated Value Per Share (in dollars per share)								$ 0.0001
Preferred Stock, Convertible, Conversion Price (in dollars per share)			$ 5.53			$ 5.53
Series C Convertible Preferred Stock [Member]
Temporary Equity, Shares Outstanding (in shares)			57,630			57,630		42,490
Temporary Equity, Par or Stated Value Per Share (in dollars per share)								$ 0.0001
Temporary Equity, Stock Issued During Period, Shares, New Issues (in shares)		10,500
Temporary Equity, Issued Price Per Share (in dollars per share)		$ 1,000
Temporary Equity, Stock Issued During Period, Value, New Issues		$ 10,500
Temporary Equity, Stock Issued During Period, Shares Issued for Services (in shares)		210
Preferred Stock, Convertible, Conversion Price (in dollars per share)			$ 2.98			$ 2.98
Convertible Preferred Stock [Member]
Temporary Equity, Issued Price Per Share (in dollars per share)			$ 1,000			$ 1,000
Temporary Stock, Threshold Trading Days for Conversion (Day)					60 days
Temporary Stock, Threshold Consecutive Trading Days for Conversion (Day)						90 days
Temporary Stock, Conversion Price Minimum Percentage						175.00%
Temporary Stock, Maximum Business Days Following FID Event for Conversion (Day)						10 days
Temporary Equity, Dividend Rate Percentage						12.00%
Dividends, Preferred Stock, Paid-in-kind						$ 17,700	$ 13,000
Convertible Preferred Stock [Member] | Subsequent Event [Member]
Dividends, Preferred Stock, Paid-in-kind	$ 6,500