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Income Taxes (Narrative) (Details) - USD ($)
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Operating Loss Carryforwards [Line Items]      
U.S. federal statutory income tax rate 21.00% 21.00% 21.00%
Operating loss carryforwards indefinitely $ 13,016,000    
Operating loss carryforwards, limitations on use The Company also has indefinite life carryforwards as a result of interest limitations. Starting in 2022, the Company has research costs attributable to research and development that are currently expensed but are required to be capitalized for U.S. tax purposes and amortized primarily over 5 or 15 years.    
Period of unrecognized tax benefits not expected to be changed 12 months    
Interest and penalties recorded $ 0 $ 0 $ 0
Proposed global minimum tax percentage 15.00%    
Deferred tax assets valuation allowance $ 6,558,000 6,012,000  
Minimum [Member]      
Operating Loss Carryforwards [Line Items]      
Research and development expense amortized period 5 years    
Maximum [Member]      
Operating Loss Carryforwards [Line Items]      
Research and development expense amortized period 15 years    
Domestic Tax Authority [Member]      
Operating Loss Carryforwards [Line Items]      
Loss carryforwards for federal income tax purposes $ 14,012,000 54,376,000  
Operating loss carryforwards expiration amount $ 996,000    
Operating loss carryforwards expiration year 2037    
Deferred tax assets valuation allowance $ 0 0  
State and Local Jurisdiction [Member]      
Operating Loss Carryforwards [Line Items]      
Loss carryforwards for federal income tax purposes 182,445,000 188,884,000  
Valuation allowance for net operating loss carryforwards $ 6,558,000 $ 5,988,000  
State and Local Jurisdiction [Member] | Minimum [Member]      
Operating Loss Carryforwards [Line Items]      
Operating loss carryforwards expiration year 2027    
State and Local Jurisdiction [Member] | Maximum [Member]      
Operating Loss Carryforwards [Line Items]      
Operating loss carryforwards expiration year   2043  
Foreign Tax Authority [Member]      
Operating Loss Carryforwards [Line Items]      
Loss carryforwards for federal income tax purposes $ 0 $ 69,000  
Valuation allowance for net operating loss carryforwards $ 0 $ 24,000  
Foreign Tax Authority [Member] | Minimum [Member]      
Operating Loss Carryforwards [Line Items]      
Operating loss carryforwards expiration year 2023    
Foreign Tax Authority [Member] | Maximum [Member]      
Operating Loss Carryforwards [Line Items]      
Operating loss carryforwards expiration year 2028