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Debt and Leases - Leases (Details) - USD ($)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Leases:      
Rental expense $ 696,000 $ 767,000 $ 800,000
Future minimum operating lease payments:      
2016 539,000    
2017 486,000    
2018 328,000    
2019 192,000    
Thereafter 0    
Total minimum lease payments $ 1,545,000    
Warehouse and distribution center      
Leases:      
Operating lease duration 5 years