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Note 11 - Reserves (Tables)
12 Months Ended
Dec. 31, 2019
Notes Tables  
Summary of Valuation Allowance [Table Text Block]
Description
 
Balance at
Beginning of Year
   
Increase
   
Decrease
   
Balance at
End of Year
 
    (in thousands)                  
Allowance for Doubtful Accounts
                               
2019
  $
34
    $
1
    $
-
    $
35
 
2018
  $
40
    $
-
    $
(6
)   $
34