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Note 5 - Accounts Receivable, Net (Tables)
 12 Months Ended
Dec. 31, 2019
Notes Tables  
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]
   
December 31,
  
(in thousands)
  
2019
    
2018
  
Accounts receivable
   $
13,785
     $
9,246
  
Less allowance for uncollectible accounts receivable
    
(116
 )    
(88
 )
Accounts receivable, net
   $
13,669
     $
9,158
  
Financing Receivable, Allowance for Credit Loss [Table Text Block]
   
December 31,
  
(in thousands)
  
2019
    
2018
  
Balance at beginning of period
   $
(88
 )   $
—
  
Provision for bad debt expense
    
(36
 )    
(88
 )
Write-off
    
8
      
—
  
Balance at end of period
   $
(116
 )   $
(88
 )