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Note 3 - Accounts Receivable, Net
 12 Months Ended
Dec. 31, 2016
Notes to Financial Statements  
Financing Receivables [Text Block]
3.
Accounts receivable
, net
 
Accounts receivable, net, consisted of the following as of:
 
 
 
December 31,
 
(in thousands)
 
201
6
 
 
201
5
 
                 
Accounts receivable
   $
14,050
     $
7,372
  
Less allowance for uncollectible accounts receivable
    
(785
 )    
(314
 )
Accounts receivable, net
   $
13,265
     $
7,058
  
 
Activity for the allowance for uncollectible accounts receivable is as follows:
 
 
 
December 31,
 
(in thousands)
 
201
6
 
 
201
5
 
 
201
4
 
                         
Balance at beginning of period
   $
(314
 )   $
(114
 )   $
(165
 )
Provision for bad debt expense
    
(471
 )    
(200
 )    
—
  
Write-off, net of recoveries
    
—
      
—
      
51
  
                         
Balance at end of period
   $
(785
 )   $
(314
 )   $
(114
 )