Long-Term Debt and Notes Payable (Details Textual) (USD $)	3 Months Ended
	Apr. 30, 2013	Apr. 30, 2012	Aug. 31, 2012
Long-Term Debt and Notes Payable (Textual) [Abstract]
Collateral securities	The Revolving Credit Facility and any term loans are collateralized by essentially all of the Company’s domestic assets
Maximum [Member]
Line of Credit Facility [Line Items]
Debt to shareholders equity ratio	1.0
Minimum [Member]
Line of Credit Facility [Line Items]
Current assets to current liabilities ratio	1.0
Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Interest rate	3.25%
Interest description	Interest is payable monthly at the greater of the prime rate or 3.25% as of April 30, 2013.
Revolving Credit Facility [Member] | Maximum [Member]
Line of Credit Facility [Line Items]
Available borrowings under the revolving credit facility to secure letters of credit	$ 10,000,000
Standby Letters of Credit [Member]
Line of Credit Facility [Line Items]
Outstanding standby letters of credit	622,000
First Victoria Bank [Member] | Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Average borrowings under the revolving credit facility	6,983,000	15,634,000
Amortization period	48 months
Maximum borrowing amount on a revolving basis			50,000,000
First Victoria Bank [Member] | Revolving Credit Facility [Member] | Maximum [Member]
Line of Credit Facility [Line Items]
Limit of indebtedness	10,000,000
Current assets to current liabilities ratio	1.25
First Victoria Bank [Member] | Revolving Credit Facility [Member] | Minimum [Member]
Line of Credit Facility [Line Items]
Quarterly earnings before interest, taxes, depreciation and amortization	2,000,000
Debt to shareholders equity ratio	0.7
First Victoria Bank [Member] | Amendment to revolving credit facility [Member]
Line of Credit Facility [Line Items]
Interest rate	3.25%
Interest description	Interest at the prime rate, with a floor of 3.25%
Maturity date of revolving credit facility	Aug. 31, 2015
First Victoria Bank [Member] | Amendment to revolving credit facility [Member] | Maximum [Member]
Line of Credit Facility [Line Items]
Guaranty of subsidiary debt	$ 5,000,000