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Long-Term Debt - Credit Facilities Outstanding (Details) - Asset Based (AB) Credit Facility - Line of Credit - Revolving credit facility
6 Months Ended
Jun. 30, 2019
USD ($)
Line of Credit Facility [Line Items]  
Total Capacity $ 48,342,000
Amount Borrowed 0
Outstanding Letters of Credit 0
Available Capacity $ 48,342,000
LIBOR  
Line of Credit Facility [Line Items]  
Basis spread on variable rate 2.00%
Base Rate  
Line of Credit Facility [Line Items]  
Basis spread on variable rate 1.00%
Step-down percentage based on the previous quarter's excess availability 0.50%