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Note 2 - Summary of Significant Accounting Policies (Tables)
12 Months Ended
Dec. 31, 2020
Notes Tables  
Schedule of Weighted Average Number of Shares [Table Text Block]
  

Years ended December 31,

 
  

2020

  

2019

  

2018

 

Weighted average shares outstanding – basic

  105,700   107,329   109,375 

Effect of common stock equivalents

  1,066   978   1,053 

Weighted average shares outstanding – diluted

  106,766   108,307   110,428