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Note 3 - Summary of Significant Accounting Policies (Tables)
12 Months Ended
Dec. 31, 2020
Notes Tables  
Accounts Receivable, Allowance for Credit Loss [Table Text Block]
(In thousands)   2020
     
Allowance for doubtful accounts, December 31, 2019   $
13,136
 
Bad debt expense    
11,624
 
Write-offs to accounts receivable    
(9,446
)
Recoveries to accounts receivable    
169
 
Adjustment to opening retained earnings    
53
 
Other    
286
 
Allowance for doubtful accounts, December 31, 2020   $
15,822