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Property and Equipment (Details Textual) (USD $)
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3 Months Ended | 6 Months Ended | 12 Months Ended | ||
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Jun. 30, 2012
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Jun. 30, 2011
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Jun. 30, 2012
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Jun. 30, 2011
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Dec. 31, 2011
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| Property and Equipment (Textual) [Abstract] | |||||
| Pump equipment | $ 6,800,000 | $ 7,400,000 | |||
| Depreciation expense included in accumulated depreciation | 2,500,000 | 2,500,000 | 2,200,000 | ||
| Depreciation expense | $ 1,500,000 | $ 1,600,000 | $ 2,903,000 | $ 3,167,000 | |
| X | ||||||||||
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- Definition
Accumulated depreciation on pump equipments.
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| X | ||||||||||
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- Definition
Property and equipment.
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| X | ||||||||||
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- Definition
Pump equipments net.
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| X | ||||||||||
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- Details
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