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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, 2021
Dec. 31, 2020
Dec. 31, 2019
Balance   $ 2,700  
Affiliate credit loss impairment expense $ 400 52,981 $ 0
Write offs     (2,600)
Balance     2,700
Trade Accounts Receivable [Member]      
Balance 1,516 70  
Affiliate credit loss impairment expense 838 1,283  
Other 0 0  
Write offs (406)    
Other 0 0  
Balance 1,948 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 71,800 20,083  
Affiliate credit loss impairment expense 400 52,981  
Other 256 (1,264)  
Write offs 0    
Other 256 (1,264)  
Balance $ 72,456 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