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Note 1 - Basis of Presentation (Tables)
9 Months Ended
Sep. 30, 2020
Notes Tables  
Schedule of Cash and Cash Equivalents [Table Text Block]

Nine months ended September 30,

 

2020

  

2019

 

Cash, cash equivalents and restricted cash, beginning of period

 $268,108  $278,629 

End of the period

        

Cash and cash equivalents

  388,024   184,673 

Restricted cash

  1,512   5,658 

Total cash, cash equivalents and restricted cash, end of period

  389,536   190,331 

Net increase (decrease) in cash, cash equivalents and restricted cash

 $121,428  $(88,298)