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Segment Reporting (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Segment Reporting Information [Line Items]    
Sales $ 21,684 $ 39,666
Gross profit 13,544 30,896
Total assets 17,221 25,936
Interest expense 607 435
Income tax expense (benefit) (790) 788
Goodwill impairment 251  
Intangible impairment 160  
Reporting Segments
    
Segment Reporting Information [Line Items]    
Sales 21,684 39,666
Gross profit 13,544 30,896
Total assets 18,330 25,936
Interest expense 607 435
Depreciation and amortization 839 912
Income tax expense (benefit) (790) 788
Goodwill impairment 251  
Intangible impairment 160  
Reporting Segments | ZMI & ZBC
    
Segment Reporting Information [Line Items]    
Sales 21,184 39,372
Gross profit 13,333 30,708
Total assets 17,564 25,262
Interest expense 607 435
Depreciation and amortization 732 854
Income tax expense (benefit) (523) 1,264
Goodwill impairment     
Intangible impairment     
Reporting Segments | ZND & ZEU
    
Segment Reporting Information [Line Items]    
Sales 500 294
Gross profit 211 188
Total assets 756 674
Interest expense      
Depreciation and amortization 99 54
Income tax expense (benefit) (72) (236)
Goodwill impairment 251  
Intangible impairment 160  
Reporting Segments | ZMS
    
Segment Reporting Information [Line Items]    
Sales      
Gross profit      
Total assets 10   
Interest expense      
Depreciation and amortization 8 4
Income tax expense (benefit) (195) (241)
Goodwill impairment     
Intangible impairment