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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, 2021
USD ($)
Trade Accounts Receivable [Member]  
Balance $ 1,516
Current period provision for expected credit losses 709
Write offs (89)
Other 0
Balance 2,136
Due from Affiliate [Member]  
Balance 71,800
Current period provision for expected credit losses 0
Write offs 0
Other (205)
Balance $ 71,595