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Note 4 - Accounts Receivable, Net
 12 Months Ended
Dec. 31, 2018
Notes to Financial Statements  
Financing Receivables [Text Block]
4.
Accounts receivable, net
 
Accounts receivable, net, consisted of the following as of:
 
   
December 31,
  
(in thousands)
  
2018
    
2017
  
Accounts receivable
   $
9,246
     $
6,021
  
Less allowance for uncollectible accounts receivable
    
(88
)
    
—
  
Accounts receivable, net
   $
9,158
     $
6,021
  
 
Activity for the allowance for uncollectible accounts receivable is as follows:
 
   
December 31,
  
(in thousands)
  
2018
    
2017
    
2016
  
Balance at beginning of period
   $
—
     $
—
     $
—
  
Provision for bad debt expense
    
(88
)
    
—
      
—
  
Write-off
    
—
      
—
      
—
  
Balance at end of period
   $
(88
)
   $
—
     $
—