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Long-Term Debt (Notes) (Narrative) (Details) - Notes [Member] - USD ($)
Mar. 18, 2019
Mar. 30, 2018
Jan. 21, 2016
Aug. 31, 2011
Gorbert Inc. [Member]        
Debt Instrument [Line Items]        
Debt instrument, aggregate principal amount     $ 20,000,000  
Debt instrument, maturity date Mar. 17, 2021 Mar. 17, 2020 Mar. 17, 2019  
Aggregate principal payment required if maturity date extend $ 2,000,000 $ 2,000,000    
Current portion of long-term debt $ 2,000,000      
Gorbert Inc. [Member] | Since August 17, 2017 [Member]        
Debt Instrument [Line Items]        
Debt instrument interest rate     6.00%  
North Jackson Facility [Member]        
Debt Instrument [Line Items]        
Debt instrument, aggregate principal amount       $ 20,000,000