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Note 11 - Reserves (Tables)
12 Months Ended
Dec. 31, 2020
Notes Tables  
Summary of Valuation Allowance [Table Text Block]
Description
 
Balance at
Beginning of Year
   
Increase
   
Balance at
End of Year
 
   
(in thousands)
         
Allowance for Doubtful Accounts
                       
2020
  $
35
    $
185
    $
220
 
2019
  $
34
    $
1
    $
35