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Geographic Segment Data (Details) (USD $)
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2013
Segment Reporting Information [Line Items]      
Sales to outside customers $ 14,920,000 $ 13,345,000  
Total Assets 39,139,000   39,072,000
United States [Member]
      
Segment Reporting Information [Line Items]      
Sales to outside customers 10,770,000 9,871,000  
Total Assets 27,589,000   28,758,000
United Kingdom [Member]
      
Segment Reporting Information [Line Items]      
Sales to outside customers 926,000 646,000  
Total Assets 1,728,000   1,025,000
Europe [Member]
      
Segment Reporting Information [Line Items]      
Sales to outside customers 394,000 242,000  
Total Assets 1,252,000   1,145,000
Mexico [Member]
      
Segment Reporting Information [Line Items]      
Sales to outside customers 2,830,000 2,586,000  
Total Assets $ 8,624,000   $ 8,144,000