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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 |  |

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