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Note 3 - Supplemental Cash Flow Information (Tables)
 12 Months Ended
Dec. 31, 2018
Notes Tables  
Schedule of Cash Flow, Supplemental Disclosures [Table Text Block]
    Years Ended December 31,
    2018   2017   2016
    (in thousands)
Cash paid for:
 
 
 
 
 
 
 
 
 
 
 
 
Interest   $
1,303
     $
47
     $
66
  
Income taxes, net of refunds   $
3,463
     $
3,878
     $
3,562
  
                         
Non-cash investing and financing activities:                        
Capital additions accrued but not yet paid   $
218
     $
85
     $
87