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Note 7 - Geographic Segment Data (Tables)
 3 Months Ended
Mar. 31, 2018
Notes Tables  
Schedule of Segment Reporting Information, by Segment [Table Text Block]
   
Net Sales to Outside Customers
                  
   
For the Three Months Ended
    
Total Assets at
  
   
March 31,
    
March 31,
     December 31,  
   
2018
    
2017
    
2018
    
2017
  
                                 
United States
   $
9,738,000
     $
11,647,000
     $
29,094,000
     $
27,784,000
  
Europe
    
1,362,000
      
947,000
      
3,142,000
      
2,989,000
  
Mexico
    
2,186,000
      
2,023,000
      
9,844,000
      
8,288,000
  
United Kingdom
    
693,000
      
743,000
      
1,450,000
      
923,000
  
                                 
    $
13,979,000
     $
15,360,000
     $
43,530,000
     $
39,984,000