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Credit Arrangement (Details) - Credit Agreement [Member] - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Line of Credit Facility, Amount [Abstract]    
Maximum borrowing capacity $ 60.0 $ 50.0
Maturity date Mar. 31, 2021 Sep. 01, 2016
Sale leaseback transactions or real estate sales as covenant $ 100.0  
Current borrowing base 57.5  
Reduction in borrowing base due to deficit in fixed charges coverage ratio test $ 6.0  
Number of trailing months to compute fixed charges coverage ratio 12 months  
Net availability $ 51.5  
Line of credit outstanding 0.0  
Maximum [Member]    
Line of Credit Facility, Amount [Abstract]    
Unused availability covenant limit to pay dividends or repurchase capital stock $ 12.0