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Line of Credit
6 Months Ended
Jan. 31, 2012
Line of Credit [Abstract]  
Line of Credit
4.
Line of Credit

The Company maintains an unsecured line of credit available for working capital and letters of credit of $20.5 million at interest rates ranging from 3% to 5% at January 31, 2012.  Other lines are available solely for letters of credit in the amount of $13.5 million.  The Company guarantees the line of credit of Walsh Environmental Scientists and Engineers, LLC (Walsh).  Its lenders have reaffirmed the Company’s lines of credit within the past twelve months.  At January 31, 2012 and July 31, 2011 the Company had letters of credit and loans outstanding totaling approximately $9.2 million and $4.1 million, respectively.   After letters of credit and loans, there was $24.8 million of availability under the lines of credit at January 31, 2012, of which $14.0 million is available for working capital.