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Segment Reporting
 12 Months Ended
Dec. 31, 2012
Segment Reporting [Abstract]  
SEGMENT REPORTING

(17) SEGMENT REPORTING

At December 31, 2012, the Company has determined that it has three reporting segments comprised of the following subsidiaries, ZMI and ZBC, ZND and ZEU, and ZMS. This determination was made based on the nature of the products and services offered to customers or the nature of the function in the organization. The accounting policies for each of these segments are the same as those described in Note 2, and inter-segment transactions are eliminated. Net revenue was primarily generated from sales in the United States.

 

 

                                 
    ZMI &
ZBC		     ZND
&
ZEU		     ZMS     TOTAL  

YEAR ENDED DECEMBER 31, 2012

                                

Sales

   $ 39,372     $ 294     $ —       $ 39,666  

Income (loss) from operations

     4,380       (813 )      (830 )      2,737  

Capital expenditures

     1,300       19       2       1,321  

Intangible assets, net

     9       194       —         203  

Goodwill

     —         251       —         251  

Total assets

     25,262       674       —         25,936  

Depreciation and amortization

     854       54       4       912  

Income tax expense (benefit)

     1,264       (236 )      (240 )      788  

Interest expense

     435       —         —         435  

Interest income

     3       —         —         3  

YEAR ENDED DECEMBER 31, 2011

                                

Sales

   $ 34,148     $ —       $ —       $ 34,148  

Income from operations

     3,101       —         —         3,101  

Capital expenditures

     1,267       —         —         1,267  

Intangible assets, net

     —         —         —         —    

Goodwill

     —         —         —         —    

Total assets

     21,785       —         —         21,785  

Depreciation and amortization

     897       —         —         897  

Income tax expense

     1,080       —         —         1,080  

Interest expense

     460       —         —         460  

Interest income

     1       —         —         1