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Segment Reporting (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Summarized information about reported segment    
Sales $ 39,666 $ 34,148
Income (loss) from operations 2,737 3,101
Capital expenditures 1,321 1,267
Intangible assets, net 203  
Goodwill 251  
Total assets 25,936 21,785
Income tax expense (benefit) 788 1,080
Interest expense 435 460
Interest income 3 1
Operating Segments [Member]
    
Summarized information about reported segment    
Sales 39,666 34,148
Income (loss) from operations 2,737 3,101
Capital expenditures 1,321 1,267
Intangible assets, net 203   
Goodwill 251   
Total assets 25,936 21,785
Depreciation and amortization 912 897
Income tax expense (benefit) 788 1,080
Interest expense 435 460
Interest income 3 1
Operating Segments [Member] | ZMI & ZBC [Member]
    
Summarized information about reported segment    
Sales 39,372 34,148
Income (loss) from operations 4,380 3,101
Capital expenditures 1,300 1,267
Intangible assets, net 9  
Goodwill     
Total assets 25,262 21,785
Depreciation and amortization 854 897
Income tax expense (benefit) 1,264 1,080
Interest expense 435 460
Interest income 3 1
Operating Segments [Member] | ZND & ZEU [Member]
    
Summarized information about reported segment    
Sales 294  
Income (loss) from operations (813)  
Capital expenditures 19  
Intangible assets, net 194  
Goodwill 251  
Total assets 674  
Depreciation and amortization 54  
Income tax expense (benefit) (236)  
Interest expense     
Interest income     
Operating Segments [Member] | ZMS [Member]
    
Summarized information about reported segment    
Income (loss) from operations (830)  
Capital expenditures 2  
Intangible assets, net     
Goodwill     
Total assets     
Depreciation and amortization 4  
Income tax expense (benefit) (240)  
Interest expense     
Interest income