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Note 1 - Nature of Operations and Summary of Significant Accounting Policies - Activity in the Allowance for Credit Losses (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Affiliate credit loss impairment expense $ 52,981 $ 0 $ 0
Trade Accounts Receivable [Member]      
Balance 70    
Affiliate credit loss impairment expense 1,283    
Other 0    
Balance 1,516 70  
Trade Accounts Receivable [Member] | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]      
Balance 163    
Balance   163  
Due from Affiliate [Member]      
Balance 20,083    
Affiliate credit loss impairment expense 52,981    
Other (1,264)    
Balance 71,800 20,083  
Due from Affiliate [Member] | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]      
Balance $ 0    
Balance   $ 0