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Concentration of Credit Risk
12 Months Ended
Dec. 31, 2011
Concentration of Credit Risk [Abstract]  
Concentration of Credit Risk
Note 6 - Concentration of Credit Risk
 
Trade accounts receivable subject Delta to the potential for credit risk with customers in the retail and distribution sectors. To reduce credit risk, Delta performs ongoing evaluations of its customers' financial condition but generally does not require collateral. As of and during the year ended December 31, 2011, Delta had one customer that accounted for 13% of trade accounts receivable.