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Note 9 - Accrued Expenses (Tables)
 12 Months Ended
Dec. 31, 2018
Notes Tables  
Schedule of Accrued Liabilities [Table Text Block]
    December 31,
    2018   2017
Compensation   $
3,529
     $
2,536
  
Benefits / self-insurance reserve    
782
      
334
  
Paid time off    
1,131
      
990
  
Commissions payable    
384
      
309
  
Other    
2,632
      
1,297
  
    $
8,458
     $
5,466