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Note 8 - Long-term Debt (Tables)
6 Months Ended
Jun. 30, 2018
Notes Tables  
Schedule of Long-term Debt Instruments [Table Text Block]
   
June 30
,
   
December 31,
 
   
2018
   
2017
 
Revolving credit agreement
 
$
54,950
    $
61,225