Note 10 - Stockholders' Equity (Details Textual) - USD ($) $ / shares in Units, $ in Thousands		1 Months Ended	3 Months Ended	12 Months Ended
	Jul. 31, 2023	Jul. 31, 2023	Dec. 31, 2023	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023	Aug. 01, 2025	Feb. 27, 2025	Nov. 05, 2023	Jul. 31, 2017
Dividends, Common Stock, Cash				$ 0	$ 0	$ 0
Proceeds from Warrant Exercises				$ 0	4	$ 111,483
New Creditor Warrants [Member]
Class of Warrant or Right, Outstanding (in shares)				21,400
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
GulfMark Creditor 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)				1.1
Class Of Warrant Or Right, Issued During Period (in shares)				53,555
Series A Warrants [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)										$ 57.06
Series B Warrants [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)										$ 62.28
Series A and B Warrants [Member]
Class of Warrant or Right, Exercised During Period (in shares)	2,000,000
Stock Issued During Period, Shares, Warrants Exercised (in shares)	1,900,000
Proceeds from Warrant Exercises		$ 111,500
Class of Warrant or Right, Expired (in shares)	3,100,000	3,100,000
Share Repurchase Program [Member]
Share Repurchase Program, Authorized, Amount					$ 90,700		$ 500,000	$ 90,300	$ 35,000
Stock Repurchased and Retired During Period, Shares (in shares)			590,499	2,290,204	1,384,186
Stock Repurchased and Retired During Period, Value			$ 35,000	$ 90,000	$ 90,700
Share Repurchase Program, Excise Tax, Percent			1.00%	1.00%	1.00%