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Note 19 - Warranties
 12 Months Ended
Dec. 31, 2019
Notes to Financial Statements  
Product Warranty Disclosure [Text Block]
19.
Warranties
 
Warranties are estimated and accrued at the time revenues are recorded. A rollforward of the Company’s product warranty accrual is as follows:
 
    Beginning       (Charges)\   Ending
    Balance   Additions   Credits   Balance
    (in thousands)
Year ended December 31, 2018   $
246
      
182
      
(37
 )   $
391
  
Year ended December 31, 2019   $
391
      
10
      
(149
 )   $
252