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Summary of Significant Accounting Policies (Details) - USD ($)
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Summary of Significant Accounting Policies [Line Items]      
Customer deposits $ 3,158,000   $ 3,557,000
Revenue 14,061,000 $ 12,549,000  
Backlog relating to remaining performance obligations in contracts 99,300,000    
Contract costs receivable 296,000   $ 296,000
Employees [Member]      
Summary of Significant Accounting Policies [Line Items]      
Stock-based compensation expense 24,000 45,000  
Director [Member]      
Summary of Significant Accounting Policies [Line Items]      
Stock-based compensation expense 38,000 54,000  
Customer Deposits [Member]      
Summary of Significant Accounting Policies [Line Items]      
Revenue $ 399,000 $ 273,000