Note 11 - Stockholders' Equity (Details Textual) - USD ($)						12 Months Ended
	Nov. 10, 2022	Aug. 12, 2022	Jun. 24, 2022	Apr. 22, 2022	Nov. 16, 2021	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2017
Stock Repurchased During Period, Shares (in shares)						0
Dividends, Common Stock, Cash						$ 0
Class Of Warrant Or Right, Issued During Period (in shares)									11,543,814
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares)						1
Proceeds from Issuance of Common Stock						$ 187,832,000	$ 0	$ 0
Common Stock, Par or Stated Value Per Share (in dollars per share)						$ 0.001	$ 0.001
At-the-market Sales Agreement [Member]
Common Stock, Par or Stated Value Per Share (in dollars per share)					$ 0.001
Maximum Aggregate Offering Price					$ 30,000,000
Maximum Percentage of Gross Proceeds Form Each Sale of Shares, Commission					3.00%
Common Shares [Member]
Stock Issued During Period, Shares, New Issues (in shares)	3,987,914	4,048,000
Share Price (in dollars per share)	$ 30.25	$ 17.85
Proceeds from Issuance of Common Stock						$ 187,800,000
Class of Warrant or Right, Redeemed and Canceled (in shares)						8,035,914
New Creditor Warrants [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)						$ 0.001
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares)						1
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)						80,954
Series A Warrants [Member]
Class Of Warrant Or Right, Issued During Period (in shares)									2,432,432
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)									$ 57.06
Class of Warrant or Right, Exercised During Period (in shares)									0
Series B Warrants [Member]
Class Of Warrant Or Right, Issued During Period (in shares)									2,629,657
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)									$ 62.28
GLF Equity Warrants [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)						$ 0.01
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares)						165,479
Class of Warrant or Right, Exercised During Period (in shares)						0	0
Class Of Warrant Or Right, Assumed During Period (in shares)						2,300,000
Equity Warrants [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)						$ 100
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares)						1.1
Class Of Warrant Or Right, Assumed During Period (in shares)						800,000
Warrants Issued to Acquire Swire Pacific Offshore Holdings Ltd. [Member]
Class of Warrant or Right, Issued During Period, Exercise Price (in dollars per share)				$ 0.001		$ 0.001
Share Price (in dollars per share)			$ 21.83	$ 20.08
Business Combination, Indemnification Liabilities Settled						$ 1,400,000
Class of Warrant or Right, Warrants Surrendered for Settlement (in shares)						64,086
Adjustments to Additional Paid in Capital, Warrant Issued			$ 176,800,000
Fair Value Adjustment of Warrants			$ 14,200,000
Warrants Issued to Acquire Swire Pacific Offshore Holdings Ltd. [Member] | Swire Pacific Offshore Holdings Ltd. [Member]
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares (in shares)				8,100,000		8,100,000