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Note 2 - Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2018
Notes Tables  
Schedule of Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Table Text Block] <div style="display: inline; font-family: times new roman; font-size: 10pt"><table border="0" cellpadding="0" cellspacing="0" style="; font-size: 10pt; font-family: "Times New Roman", Times, serif; text-indent: 0px; min-; min-width: 700px;"> <tr style="vertical-align: bottom;"> <td style=""> </td> <td style=""> </td> <td colspan="6" rowspan="1" style="text-align: center; padding-left: 0pt;"><div style="display: inline; font-weight: bold;"><div style="display: inline; font-weight: bold;">As of December 31,</div></div> <div style="display: inline; font-weight: bold;"> </div><div style="display: inline; font-weight: bold;"> </div></td> <td style=""><div style="display: inline; font-weight: bold;"> </div></td> </tr> <tr style="vertical-align: bottom;"> <td style="width: 70%;">(In thousands)</td> <td style=""> </td> <td colspan="2" style="text-align: center; border-bottom: 1px solid rgb(0, 0, 0);"><div style="display: inline; font-weight: bold;"><div style="display: inline; font-weight: bold;">2018</div></div></td> <td style="padding-bottom: 1px;"> </td> <td style=""> </td> <td colspan="2" style="text-align: center; border-bottom: 1px solid rgb(0, 0, 0);"><div style="display: inline; font-weight: bold;"><div style="display: inline; font-weight: bold;">2017</div></div></td> <td style="padding-bottom: 1px;"> </td> </tr> <tr style="vertical-align: bottom; background-color: rgb(204, 238, 255);"> <td>Cash and cash equivalents</td> <td style="width: 1%;"> </td> <td style="width: 1%;">$</td> <td style="width: 12%; text-align: right;"><div style="display: inline; font-style: italic; font-weight: inherit; font-style: normal;">113,396</div></td> <td nowrap="nowrap" style="width: 1%; margin-left: 0pt;"> </td> <td style="width: 1%;"> </td> <td style="width: 1%;">$</td> <td style="width: 12%; text-align: right;"><div style="display: inline; font-style: italic; font-weight: inherit; font-style: normal;">96,443</div></td> <td nowrap="nowrap" style="width: 1%; margin-left: 0pt;"> </td> </tr> <tr style="vertical-align: bottom; background-color: rgb(255, 255, 255);"> <td>Restricted cash and marketable securities</td> <td style="width: 1%;"> </td> <td style="width: 1%; border-bottom: 1px solid rgb(0, 0, 0);"> </td> <td style="width: 12%; text-align: right; border-bottom: 1px solid rgb(0, 0, 0);"><div style="display: inline; font-style: italic; font-weight: inherit; font-style: normal;">8,755</div></td> <td nowrap="nowrap" style="width: 1%; padding-bottom: 1px; margin-left: 0pt;"> </td> <td style="width: 1%;"> </td> <td style="width: 1%; border-bottom: 1px solid rgb(0, 0, 0);"> </td> <td style="width: 12%; text-align: right; border-bottom: 1px solid rgb(0, 0, 0);"><div style="display: inline; font-style: italic; font-weight: inherit; font-style: normal;">7,057</div></td> <td nowrap="nowrap" style="width: 1%; padding-bottom: 1px; margin-left: 0pt;"> </td> </tr> <tr style="vertical-align: bottom; background-color: rgb(204, 238, 255);"> <td>Total cash, cash equivalents and restricted cash shown in statement of cash flows</td> <td style="width: 1%;"> </td> <td style="width: 1%; border-bottom: 3px double rgb(0, 0, 0);">$</td> <td style="width: 12%; text-align: right; border-bottom: 3px double rgb(0, 0, 0);"><div style="display: inline; font-style: italic; font-weight: inherit; font-style: normal;">122,151</div></td> <td nowrap="nowrap" style="width: 1%; padding-bottom: 3px; margin-left: 0pt;"> </td> <td style="width: 1%;"> </td> <td style="width: 1%; border-bottom: 3px double rgb(0, 0, 0);">$</td> <td style="width: 12%; text-align: right; border-bottom: 3px double rgb(0, 0, 0);"><div style="display: inline; font-style: italic; font-weight: inherit; font-style: normal;">103,500</div></td> <td nowrap="nowrap" style="width: 1%; padding-bottom: 3px; margin-left: 0pt;"> </td> </tr> </table></div>
Restricted Cash and Marketable Securities [Table Text Block]
   
As of
December 31,
  
   
2018
    
2017
  
(In thousands)
                
Federal Maritime Commission escrow
   $
5,823
     $
4,186
  
Credit card processor reserves
    
1,530
      
1,530
  
Certificates of deposit and other restricted securities
    
1,402
      
1,341
  
Total restricted cash and marketable securities
   $
8,755
     $
7,057
  
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Table Text Block]
   
As of
December 31,
  
(In thousands)
  
2018
    
2017
  
                 
Prepaid tour expenses
   $
10,617
     $
9,846
  
Prepaid air expense
    
2,973
      
3,621
  
Prepaid marketing, commissions and other expenses
    
2,622
      
2,495
  
Prepaid client insurance
    
2,516
      
2,525
  
Prepaid port agent fees    
1,433
      
1,022
  
Prepaid corporate insurance
    
1,078
      
1,033
  
Prepaid income taxes
    
24
      
809
  
Total prepaid expenses
   $
21,263
     $
21,351
  
Schedule Of Estimated Useful Lives [Table Text Block]
   
Years
  
Vessels and vessel improvements
  
 15
-
25
  
Furniture & equipment
  
 
5
 
  
Computer hardware and software
  
 
5
 
  
Leasehold improvements, including expedition sites and port facilities
  
Shorter of lease term or related asset life
  
Schedule of Accounts Payable and Accrued Liabilities [Table Text Block]
   
As of
December 31,
  
(In thousands)
  
2018
    
2017
  
                 
Accrued other expenses
   $
11,851
     $
7,664
  
Accounts payable
    
9,326
      
7,791
  
Bonus compensation liability
    
5,195
      
3,736
  
Employee liability
    
2,943
      
2,644
  
Refunds and commissions payable
    
1,533
      
1,805
  
Travel certificate liability
    
1,088
      
1,120
  
Royalty payable
    
1,005
      
1,010
  
Income tax liabilities
    
576
      
1,490
  
Accrued travel insurance expense
    
427
      
432
  
New build liability
    
-
      
2,730
  
Total accounts payable and accrued expenses
   $
33,944
     $
30,422
  
Schedule of Interest Rate Derivatives [Table Text Block]
 
Interest Rate Caps

Corporate Debt

Trade date and borrowing date
May 29, 2018
March 27, 2018
Effective date
September 27, 2018
Not applicable
Termination date
May 31, 2023
March 31, 2025
Notional amount
$100,000,000
$100,000,000
Fixed interest rate (plus spread)
2.50% until November 30, 2018
Not applicable

2.75% December 1, 2018 until April 30, 2019
 
 
3.00% May 1, 2019 until maturity
 
Variable interest rate
1 month LIBOR
1 month LIBOR + 3.50%
Settlement
Monthly on last day of each month
Monthly on last day of each month
Interest payment dates
Monthly on last day of each month
Monthly on last day of each month
Reset dates
Last day of each month
Last day of each month
Schedule of Cash Flow Hedges Included in Accumulated Other Comprehensive Income (Loss) [Table Text Block]
   
For the years ended
December 31,
  
                         
(in thousands)
  
2018
    
2017
    
2016
  
Beginning balance:
   $
-
     $
-
     $
-
  
Net change in period
    
(671
 )    
-
      
-
  
Accumulated Other Comprehensive Income
   $
(671
 )   $
-
     $
-