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Note 11 - Commitments and Contingencies (Details Textual)
kr in Millions, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Mar. 31, 2019
USD ($)
Feb. 28, 2019
NOK (kr)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
NOK (kr)
Dec. 31, 2017
USD ($)
National Geographic [Member]                  
Royalty Expense $ 1.7 $ 1.2 $ 4.8 $ 3.3          
Accounts Payable and Other Accrued Liabilities, Current 1.7   1.7       $ 1.0    
World Wildlife Fund [Member]                  
Royalty Expense $ 0.3 $ 0.3 $ 0.7 $ 0.6          
Class Vessel [Member] | Ulstein Verft [Member]                  
Vessel, Contract Price               kr 1,066 $ 134.6
Foreign Exchange Contract [Member] | Ulstein Verft [Member]                  
Vessel, Contract Price         $ 153.5 kr 1,291