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Note 4 - Fair Values of Financial Instruments (Tables)
 12 Months Ended
Dec. 31, 2018
Notes Tables  
Fair Value, by Balance Sheet Grouping [Table Text Block]
   
December 31, 2018
    
December 31, 2017
  
 
  
Carrying
    
Fair
    
Carrying
    
Fair
  
(In thousands)   
Amount
    
Value
    
Amount
    
Value
  
Financial Assets:
                                
Cash and cash equivalents
   $
6,951
     $
6,951
     $
5,934
     $
5,934
  
Accounts receivable
    
10,729
      
10,729
      
7,165
      
7,165
  
Short-term investments:
                                
U. S. agency securities
    
—
      
—
      
5,200
      
5,196
  
Financial liabilities:
                                
Accounts payable
    
(16,393
 )    
(16,393
 )    
(19,533
 )    
(19,533
 )
Term loan
    
(9,474
 )    
(9,474
 )    
—
      
—
  
Financed insurance payable
    
(287
 )    
(287
 )    
—
      
—