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Note 4 - Accounts Receivable, Net (Tables)
 3 Months Ended
Mar. 31, 2019
Notes Tables  
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]
(in thousands)
  
March 31,
2019
    
December 31,
2018
  
Accounts receivable
   $
10,241
     $
9,246
  
Less allowance for uncollectible accounts receivable
    
(88
)
    
(88
)
Accounts receivable, net
   $
10,153
     $
9,158