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Note 3 - Supplemental Cash Flow Information
6 Months Ended
Jun. 30, 2018
Notes to Financial Statements  
Cash Flow, Supplemental Disclosures [Text Block]
(
3
)
Supplemental Cash Flow Information
 
    Six Months Ended
    June 30,
    2018   2017
    (in thousands)
Cash paid for:                
Interest   $
668
    $
6
 
Income taxes, net of refunds    
784
     
1,434
 
Non-cash investing and financing activities:                
Capital additions accrued but not yet paid   $
331
    $
495