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Note 3 - Reserve for Sales Returns and Allowance (Tables)
 12 Months Ended
Dec. 31, 2018
Notes Tables  
Reserve for Sales Returns and Allowances [Table Text Block]
   
2018
    
2017
    
2016
  
Balance at the beginning of year
   $
1,125
     $
1,967
     $
1,384
  
                         
Provision for returns and allowances
    
4,908
      
2,789
      
4,445
  
                         
Actual returns and allowances paid to customers
    
(4,140
 )    
(3,631
 )    
(3,862
 )
                         
Balance at the end of year
   $
1,893
     $
1,125
     $
1,967