Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Current Assets:
Cash and cash equivalents	$ 177,719	$ 156,845
Restricted cash	46,451	30,499
Prepaid expenses and other current assets	62,394	57,158
Total current assets	286,564	244,502
Property and equipment, net	521,630	526,002
Goodwill	42,017	42,017
Intangibles, net	8,960	9,412
Other long-term assets	8,867	9,364
Total assets	868,038	831,297
Current Liabilities:
Unearned passenger revenues	290,790	252,199
Accounts payable and accrued expenses	64,962	65,055
Long-term debt - current	46	47
Lease liabilities - current	1,757	1,923
Total current liabilities	357,555	319,224
Long-term debt, less current portion	622,676	621,778
Deferred tax liabilities	2,592	2,118
Other long-term liabilities	1,668	1,943
Total liabilities	984,491	945,063
Commitments and contingencies
Redeemable noncontrolling interests	36,297	37,784
Temporary Equity, Carrying Amount, Including Portion Attributable to Noncontrolling Interests	110,946	111,298
STOCKHOLDERS’ DEFICIT
Preferred stock, $0.0001 par value, 1,000,000 shares authorized; 62,000 Series A shares issued and outstanding as of March 31, 2024 and December 31, 2023, respectively	0	0
Common stock, $0.0001 par value, 200,000,000 shares authorized; 53,524,606 and 53,390,082 issued, 53,466,674 and 53,332,150 outstanding as of March 31, 2024 and December 31, 2023, respectively	5	5
Additional paid-in capital	99,059	97,139
Accumulated deficit	(326,463)	(322,208)
Total stockholders' deficit	(227,399)	(225,064)
Total liabilities, mezzanine equity and stockholders' deficit	868,038	831,297
Series A Redeemable Convertible Preferred Stock [Member]
Current Liabilities:
Series A redeemable convertible preferred stock, 165,000 shares authorized; 62,000 shares issued and outstanding as of March 31, 2024 and December 31, 2023, respectively	$ 74,649	$ 73,514

Sum of the carrying values as of the balance sheet date of obligations incurred through that date and due within one year (or the operating cycle, if longer), including liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received, taxes, interest, rent and utilities, accrued salaries and bonuses, payroll taxes and fringe benefits.

Name:	us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of excess of issue price over par or stated value of stock and from other transaction involving stock or stockholder. Includes, but is not limited to, additional paid-in capital (APIC) for common and preferred stock.