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Property and Equipment (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 5,612us-gaap_PropertyPlantAndEquipmentGross $ 5,543us-gaap_PropertyPlantAndEquipmentGross
Less accumulated depreciation 3,577us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment 3,530us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Property and equipment, net 2,035us-gaap_PropertyPlantAndEquipmentNet 2,013us-gaap_PropertyPlantAndEquipmentNet
Depreciation expense 47us-gaap_Depreciation 306us-gaap_Depreciation
Building and improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 3,348us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= nsec_BuildingAndImprovementsMember
3,367us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= nsec_BuildingAndImprovementsMember
Electronic Data Processing Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 1,606us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= nsec_ElectronicDataProcessingEquipmentMember
1,570us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= nsec_ElectronicDataProcessingEquipmentMember
Furniture and Fixtures [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 658us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_FurnitureAndFixturesMember
$ 606us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_FurnitureAndFixturesMember