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Long-term Debt (Tables)
12 Months Ended
Dec. 31, 2020
Debt Instrument [Line Items]  
Schedule of long-term debt
   December 31, 
   2020   2019 
$15.0 million payable in 14 equal annual installments of $1.1 million beginning in January 2020 including interest imputed at 4.1% per annum  $11,208   $11,806 
$13.4 million term loan amended such that the loan was repaid in February 2021 plus interest at 0.85% per annum   13,498    
 
$111.0 million 5-year term loan payable in 20 equal quarterly installments plus interest at 1.2% per annum   
    11,254 
    24,706    23,060 
Less current maturities   14,570    12,326 
Total  $10,136   $10,734