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Note 11 - Fair Value of Financial Instruments and Derivative Instruments (Details Textual) - USD ($)
$ in Thousands
 6 Months Ended
May 07, 2021
Jun. 30, 2021
Dec. 31, 2020
Assets Held-for-sale, Not Part of Disposal Group, Current, Total   $ 25,887 $ 24,340
Vessels [Member]      
Assets Held-for-sale, Not Part of Disposal Group, Current, Total   27,047  
Assets Held-for-sale, Long Lived, Fair Value Disclosure   25,887  
Impairment of Long-Lived Assets to be Disposed of   $ 1,160  
Class B Warrants [Member]      
Class of Warrant or Right, Expired During Period (in shares) 4,200,000    
Class of Warrant or Right, Expired, Number of Securities Called by Warrants or Rights (in shares) 168,000    
Class of Warrant or Right, Exercised During Period (in shares)   0