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Note 2 - Allowance for Doubtful Accounts Receivable (Tables)
12 Months Ended
Dec. 31, 2021
Notes Tables  
Financing Receivable, Allowance for Credit Loss [Table Text Block]
  Years Ended December 31, 
  

2021

  

2020

  

2019

 

Balance at the beginning of year

 $7,667  $2,964  $2,042 

Provision for bad debts

  2,260   6,746   1,323 

Charge-offs

  (3,653)  (2,087)  (401)

Recoveries

  119   44   - 

Balance at the end of year

 $6,393  $7,667  $2,964