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Note 3 - Allowance for Credit Losses (Tables)
6 Months Ended
Jun. 30, 2021
Notes Tables  
Financing Receivable, Allowance for Credit Loss [Table Text Block]
   

Trade

   

Due

 
   

and Other

   

from

 

(In thousands)

 

Receivables

   

Affiliates

 

Balance at January 1, 2021

  $ 1,516     $ 71,800  

Current period provision for expected credit losses

    672       (1,000 )

Write offs

    (89 )      

Other

          (105 )

Balance at June 30, 2021

  $ 2,099     $ 70,695