Note 4 - Property and Equipment (Details Textual) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Depreciation, Total		$ 37,600	$ 30,500	$ 24,200
Payments to Acquire Property, Plant, and Equipment, Total		96,688	155,479	$ 96,002
Interest Paid, Capitalized, Investing Activities		$ 2,600	3,300
Crystal Esprit Yacht [Member]
Payments to Acquire Productive Assets, Total	$ 13,300
Maritime Equipment [Member]
Property, Plant and Equipment, Additions	$ 71,200		$ 149,500