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Note 2 - Supplemental Cash Flow Information (Tables)
 6 Months Ended
Jun. 30, 2017
Notes Tables  
Schedule of Cash Flow, Supplemental Disclosures [Table Text Block]
    Six Months Ended
June 30,
    2017   2016
    (in thousands)
Cash paid for:                
Interest   $
26
     $
35
  
Income taxes, net of refunds    
1,434
      
728
  
                 
Non-cash investing and financing activities:                
Capital additions accrued but not yet paid   $
495
     $
284