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Note 4 - Allowance for Credit Losses - Schedule for Allowance for Credit Losses on Financing Receivables (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Affiliate credit loss impairment credit $ 0 $ 0 $ 0 $ (1,000)
Trade Accounts Receivable [Member]        
Balance     1,948  
Affiliate credit loss impairment credit     620  
Acquisition of Sonatide joint venture (see Note 8)     0  
Other     0  
Balance 2,568   2,568  
Due from Affiliate [Member]        
Balance     72,456  
Affiliate credit loss impairment credit     0  
Acquisition of Sonatide joint venture (see Note 8)     (59,678)  
Other     (1,136)  
Balance $ 11,642   $ 11,642