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Summary of Significant Accounting Policies (Intangibles) (Details) - USD ($)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Intangible Assets [Line Items]    
Impairment of goodwill $ 0 $ 0
Intangibles, net of accumulated amortization 1,526,000 1,651,000
Amortization expense 125,000  
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]    
2018 125,000  
2019 125,000  
2020 125,000  
2021 125,000  
2022 125,000  
2023 125,000  
2024 125,000  
Finite-Lived Intangible Assets, Net [Abstract]    
Gross Carrying Value 3,159,000 3,159,000
Accumulated Amortization 1,633,000 1,508,000
Net Book Value 1,526,000 1,651,000
Impairment of intangible assets 0 0
Trade Name    
Intangible Assets [Line Items]    
Indefinite-lived intangible asset, gross carrying value 654,000  
Finite-Lived Intangible Assets, Net [Abstract]    
Gross Carrying Value 654,000 654,000
Accumulated Amortization 0 0
Net Book Value $ 654,000 $ 654,000
Developed Technology    
Intangible Assets [Line Items]    
Intangible assets, useful life 20 years 20 years
Intangible assets, weighted average remaining life 7 years  
Finite-Lived Intangible Assets, Net [Abstract]    
Gross Carrying Value $ 2,505,000 $ 2,505,000
Accumulated Amortization 1,633,000 1,508,000
Net Book Value $ 872,000 $ 997,000