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Long-Term Debt - Schedule of Future Maturities (Details) - USD ($)
Sep. 30, 2021
Dec. 31, 2020
Future maturities:    
2021 (remainder) $ 288,000  
2022 1,178,000  
2023 1,224,000  
2024 1,276,000  
2025 1,333,000  
Thereafter 31,706,000  
Long-term debt $ 37,005,000 $ 64,876,000