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Note 3 - Supplemental Cash Flow Information (Tables)
9 Months Ended
Sep. 30, 2018
Notes Tables  
Schedule of Cash Flow, Supplemental Disclosures [Table Text Block]
    Nine Months Ended
September 30,
    2018   2017
    (in thousands)
Cash paid for:                
Interest   $
853
    $
37
 
Income taxes, net of refunds    
2,308
     
3,167
 
Non-cash investing and financing activities:                
Capital additions accrued but not yet paid   $
216
    $
527