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Note 10 - Reserves (Tables)
12 Months Ended
Dec. 31, 2017
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
                               
2017
  $
57
    $
-
    $
(17
)   $
40
 
2016
  $
319
    $
578
    $
(840
)   $
57