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Debt and Leases - Leases (Details) - USD ($)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Leases:      
Rental expense $ 825,000 $ 808,000 $ 696,000
Future minimum operating lease payments:      
2018 368,000    
2019 192,000    
2020 0    
Thereafter 0    
Total minimum lease payments $ 560,000    
Warehouse and distribution center      
Leases:      
Operating lease duration 5 years