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Note 3 - Reserve for Sales Returns and Allowance (Tables)
 12 Months Ended
Dec. 31, 2017
Notes Tables  
Reserve for Sales Returns and Allowances [Table Text Block]
   
201
7
    
201
6
    
201
5
  
Balance at the beginning of yea
r
   $
1,967
     $
1,384
     $
1,308
  
                         
Provision for returns and allowance
s
    
2,789
      
4,445
      
4,547
  
                         
Actual returns and allowances paid to customer
s
    
(3,631
 )    
(3,862
 )    
(4,471
 )
                         
Balance at the end of yea
r
   $
1,125
     $
1,967
     $
1,384