Note 15 - Fair Value Measurements - Change in Fair Value of the Fuel Hedges and Interest Rate Swaps (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020		Dec. 31, 2019
Balance	$ (3,800)		$ (1,639)
Change in estimated fair value	(390)		(2,161)
Balance	$ (4,190)	[1]	$ (3,800)

[1] Recorded in accounts payable and accrued liabilities and other liabilities in the Balance Sheet to these Consolidated Financial Statements.