XML 48 R32.htm IDEA: XBRL DOCUMENT v3.8.0.1
Note 2 - Supplemental Cash Flow Information (Tables)
 12 Months Ended
Dec. 31, 2017
Notes Tables  
Schedule of Cash Flow, Supplemental Disclosures [Table Text Block]
    Years Ended December 31,
    2017   2016   2015
    (in thousands)
Cash paid for:                        
Interest   $
47
     $
66
     $
86
  
Income taxes, net of refunds   $
3,878
     $
3,562
     $
1,459
  
                         
Non-cash investing and financing activities:                        
Capital additions accrued but not yet paid   $
85
     $
87
     $
579