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Note 30 - Supplemental Cash Flow Disclosure (Tables)
12 Months Ended
Dec. 31, 2020
Notes Tables  
Schedule of Financial Instruments Owned and Pledged as Collateral [Table Text Block]
   
Year Ended December 31,
 
   
2020
   
2019
   
2018
 
Collateral deposit end of period
  $
41,119
    $
9,524
    $
4,277
 
Less: Collateral deposit beginning of period
   
9,524
     
4,277
     
1,219
 
Impact to cash flow from operations
  $
31,595
    $
5,247
    $
3,058