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Note 3 - Allowance for Credit Losses - Schedule for Allowance for Credit Losses on Financing Receivables (Details)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
USD ($)
Trade Accounts Receivable [Member]  
Balance $ 1,948
Current period provision for expected credit losses 39
Acquisition of Sonatide joint venture (see Note 7) 0
Other 0
Balance 1,987
Due from Affiliate [Member]  
Balance 72,456
Current period provision for expected credit losses 0
Acquisition of Sonatide joint venture (see Note 7) (59,678)
Other 34
Balance $ 12,812