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Debt. (Tables)
12 Months Ended
Dec. 31, 2020
Debt Disclosure [Abstract]  
Schedule of long term debt
   December 31, 
   2020   2019 
Kinergy line of credit  $32,512   $78,338 
Pekin term loan       39,500 
Pekin revolving loan   20,580    32,000 
ICP term loan       12,000 
ICP revolving loan   9,384    18,000 
CARES Act loans   9,860     
Parent notes payable   25,533    65,649 
    97,869    245,487 
Less unamortized debt premium   230    461 
Less unamortized debt financing costs   (759)   (2,153)
Less short-term portion   (25,533)   (63,000)
Long-term debt  $71,807   $180,795 
Schedule of maturities of long-term debt
December 31:    
2021  $25,533 
2022   72,336 
   $97,869