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Property And Equipment (Schedule Of Property And Equipment) (Details) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Property, Plant and Equipment [Line Items]    
Gross property and equipment $ 10,896,597us-gaap_PropertyPlantAndEquipmentGross $ 10,774,793us-gaap_PropertyPlantAndEquipmentGross
Less: Accumulated depreciation (10,001,869)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment (9,590,204)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Net property and equipment 894,728us-gaap_PropertyPlantAndEquipmentNet 1,184,589us-gaap_PropertyPlantAndEquipmentNet
Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Gross property and equipment 8,264,804us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_EquipmentMember		 8,143,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_EquipmentMember
Equipment Held For Lease [Member]    
Property, Plant and Equipment [Line Items]    
Gross property and equipment 303,412us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_AssetsHeldUnderCapitalLeasesMember		 303,412us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_AssetsHeldUnderCapitalLeasesMember
Leasehold Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Gross property and equipment $ 2,328,381us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LeaseholdImprovementsMember		 $ 2,328,381us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LeaseholdImprovementsMember