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Income Taxes - Net operating losses (Details) - USD ($)
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Income Taxes      
Net operating losses $ 2,400,000 $ 1,900,000 $ 4,300,000
NOLs, annual limitations on use   71,000  
Federal      
Income Taxes      
Net operating losses 500,000 600,000  
NOLs, annual limitations on use   29,700,000  
NOLs, without regard to this permanent write-off 29,700,000    
State      
Income Taxes      
Net operating losses 1,900,000 1,300,000  
NOLs, annual limitations on use   $ 13,700,000  
NOLs, without regard to this permanent write-off $ 13,700,000