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Note 4 - Financial Statement Details - Restricted Cash and Marketable Securities (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Sep. 30, 2018
Total restricted cash and marketable securities $ 7,995 $ 8,755 $ 8,593
Federal Maritime Commission Escrow [Member]      
Total restricted cash and marketable securities 6,476 5,823  
Certificates of Deposit and Other Restricted Securities [Member]      
Total restricted cash and marketable securities 1,519 1,402  
Credit Card Processor Reserves [Member]      
Total restricted cash and marketable securities $ 1,530