Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Current Assets:
Cash and cash equivalents	$ 155,562	$ 187,531
Restricted cash	29,474	16,984
Marine operating supplies	5,894	5,473
Inventories	2,122	2,168
Prepaid expenses and other current assets	27,078	17,014
Total current assets	220,130	229,170
Property and equipment, net	547,771	482,673
Goodwill	32,772	22,105
Intangibles, net	10,165	4,817
Deferred tax asset	8,188	5,539
Right-to-use lease assets	4,230	5,082
Other long-term assets	7,374	8,063
Total assets	830,630	757,449
Current Liabilities:
Unearned passenger revenues	189,641	120,737
Accounts payable and accrued expenses	48,317	22,341
Lease liabilities - current	1,418	1,475
Long-term debt - current	20,260	11,255
Total current liabilities	259,636	155,808
Long-term debt, less current portion	526,857	471,359
Lease liabilities	3,124	3,915
Other long-term liabilities	95	90
Total liabilities	789,712	631,172
COMMITMENTS AND CONTINGENCIES
Redeemable noncontrolling interest	10,134	7,494
Temporary Equity, Carrying Amount, Including Portion Attributable to Noncontrolling Interests, Ending Balance	97,919	91,319
STOCKHOLDERS’ EQUITY
Preferred stock, $0.0001 par value, 1,000,000 shares authorized; 85,000 Series A shares issued and outstanding as of September 30, 2021 and December 31, 2020	0	0
Common stock, $0.0001 par value, 200,000,000 shares authorized; 50,191,647 and 49,905,512 issued, 50,146,407 and 49,818,676 outstanding as of September 30, 2021 and December 31, 2020, respectively	5	5
Additional paid-in capital	52,146	48,127
Accumulated deficit	(108,411)	(11,572)
Accumulated other comprehensive loss	(741)	(1,602)
Total stockholders' (deficit) / equity	(57,001)	34,958
Total liabilities, mezzanine equity and stockholders' equity	830,630	757,449
Series A Redeemable Convertible Preferred Stock [Member]
Current Liabilities:
Series A redeemable convertible preferred stock, 165,000 shares authorized; 85,000 shares issued and outstanding as of September 30, 2021 and December 31, 2020, respectively	$ 87,785	$ 83,825