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Long-term Debt (Tables)
12 Months Ended
Dec. 31, 2019
Disclosure Text Block [Abstract]  
Schedule of Long-term Debt Instruments [Table Text Block]
   December 31, 
   2019   2018 
        
$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  $11,806   $11,291 
$111.0 million 5-year term loan payable in 20 equal quarterly installments plus interest at 1.2% per annum   11,254    34,350 
Other   
    420 
    23,060    46,061 
Less current maturities   12,326    23,155 
Total  $10,734   $22,906