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Long-Term Debt - Additional Information (Details) - USD ($)
6 Months Ended
Apr. 21, 2020
Jun. 30, 2021
Jun. 30, 2020
Apr. 21, 2021
Dec. 31, 2020
Jul. 28, 2018
Debt Instrument            
Amount drawn   $ 500,000 $ 750,000      
Long-term debt   9,861,000     $ 9,928,000  
Principal maturities of long-term debt for 2021   2,754,000        
Principal maturities of long-term debt for 2022   6,614,000        
Principal maturities of long-term debt for 2023   231,000        
Principal maturities of long-term debt for 2024   178,000        
Principal maturities of long-term debt for 2025   $ 84,000        
Paycheck protection program payable to financial institutions: Interest rate of 1% per annum. Unforgiven portion is payable monthly until April 20, 2022 (A)            
Debt Instrument            
Debt Instrument, Face Amount       $ 4,000,000    
Debt Instrument, Term 2 years          
Percentage of fixed interest rate payable   1.00%        
Lease term for equipment covered by lease line of credit 2 years          
Line of credit payable to a financial institution; Interest rate option of bank prime or Libor plus 2.15000% (B)(C)            
Debt Instrument            
Maximum borrowing capacity   $ 6,000,000        
Spread on variable rate   2.15%        
Commitment fee on unused portion of line of credit   0.25%        
Balance outstanding of line of credit   $ 4,250,000     3,750,000  
Long-term debt   4,250,000     3,750,000  
Equipment note obligations; Interest rate fixed for term of each funding based upon the Lender's lease pricing at time of funding. (Interest rate/factor 1.795530% - 1.835015% as of June 30, 2021)(D)            
Debt Instrument            
Maximum borrowing capacity   1,000,000        
Amount drawn   384,500        
Balance outstanding of line of credit   $ 819,000     534,000  
Loan term for equipment covered by loan   60 months        
Long-term debt   $ 819,000     534,000  
Equipment financing lease obligations; Interest rate fixed for term of each funding based upon the Lender's lease pricing at time of funding. (Interest rate/ factor 1.822758% - 1.869304% at time of funding)(E)            
Debt Instrument            
Debt Instrument, Term   60 months        
Lease line of credit           $ 1,000,000
Lease term for equipment covered by lease line of credit   60 months        
Long-term debt   $ 232,000     $ 310,000