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Note 14 - Financial Instruments (Details Textual)
$ in Thousands
12 Months Ended
Feb. 21, 2020
USD ($)
Jan. 21, 2020
USD ($)
Jul. 15, 2019
USD ($)
Jan. 17, 2019
USD ($)
Dec. 31, 2020
USD ($)
shares
Dec. 31, 2019
USD ($)
shares
Dec. 31, 2018
USD ($)
Nov. 06, 2019
shares
Assets Held-for-sale, Not Part of Disposal Group, Total           $ 55,581    
Assets Held-for-sale, Long Lived, Fair Value Disclosure           43,271    
Impairment of Long-Lived Assets to be Disposed of           12,310    
Equity Method Investments           22,450    
Equity Method Investments, Fair Value Disclosure           19,306    
Equity Method Investment, Other than Temporary Impairment         $ (0) $ 3,144 $ (0)  
Increase (Decrease) in Volatility Rate Applied         5.00%      
Fair Value Assumptions Resulting Increase (Decrease) in Fair Value         1.00%      
Measurement Input, Price Volatility [Member]                
Warrants and Rights Outstanding, Measurement Input         1.09      
Class B Warrants [Member]                
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | shares         168,000 168,000   168,000
Class B Warrants [Member] | Measurement Input, Price Volatility [Member]                
Warrants and Rights Outstanding, Measurement Input               1.34
Interest Rate Swap [Member]                
Derivative Instruments Not Designated as Hedging Instruments, Gain       $ 213        
Derivative Instruments Not Designated as Hedging Instruments, Loss $ 927 $ 405 $ 205