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Notes Payable (Tables)
12 Months Ended
Dec. 31, 2020
Notes Payable [Abstract]  
Notes payable
   December 31,
   2020  2019
Note payable to Summit Community Bank (the "Bank"), maturing September 2021; with monthly payments of approximately $26 of principal and interest fixed at 3.99%; collateralized by principally all assets of the Company.  $227   $519 
           
Note payable to the Bank, maturing July 2031; with monthly payments of approximately $11 of principal and interest fixed at 5.29%; collateralized by principally all assets of Smith-Columbia Corporation and guaranteed by the Company.   —      1,103 
           
Note payable to the Bank, maturing October 2029; with monthly payments of approximately $22 of principal and interest fixed at 3.64% under a swap agreement; collateralized by principally all assets of Smith-Carolina Corporation and guaranteed by the Company.   2,008    2,197 
           
Note payable to the Bank, maturing March 2030; with monthly payments of approximately $27 of principal and interest fixed at 3.99%; collateralized by principally all assets of the Company.   2,535    —   
           
Installment notes, collateralized by certain machinery and equipment maturing at various dates; with monthly payments varying from $0.7 to $6.2 with annual interest rates between 2.90% and 5.29%.   166    1,192 
           
A revolving line-of-credit evidenced by a note payable to the Bank, with the maximum amount of $4,000, maturing October 1, 2021, with interest only payments and an initial rate of 4.49% adjustable monthly (4.75% at December 31, 2020). The line-of-credit is collateralized by a first lien position on the Company's accounts receivable and inventory and a second lien position on all other business assets.   —      —   
           
    4,936    5,011 
Less current maturities   (740)   (925)
           
   $4,196   $4,086 
Maturities of notes payable
Year Ending December 31,   
    
 2020   $740 
 2021    471 
 2022    483 
 2023    496 
 2024    511 
 Thereafter    2,235 
        
     $4,936