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Note 8 - Asset Retirement Obligations | 3 Months Ended
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Nov. 30, 2013
Asset Retirement Obligation Disclosure [Abstract] |
Asset Retirement Obligation Disclosure [Text Block] | 8. Asset Retirement Obligations The Company recognizes asset retirement obligations in the period in which they are incurred if a reasonable estimate of fair value can be made. The associated asset retirement costs are capitalized as part of the carrying amount of the long-lived asset. The Company continues to depreciate, on a straight-line basis, the amount added to property, plant and equipment and recognizes accretion expense in connection with the discounted liability over the various remaining lives which range from approximately seven to thirty years. A reconciliation of the Company’s asset retirement liability is as follows (in thousands):
|  | November 30, 2013 |
Beginning balance as of August 31, 2013 |  | $ | 10,796 |
Accretion expense |  |  | 181 |
Ending balance as of November 30, 2013 |  | $ | 10,977 |
Asset retirement obligations are included in long-term accrued liabilities in the accompanying Consolidated Balance Sheet.

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- Definition The entire disclosure for an asset retirement obligation and the associated long-lived asset. An asset retirement obligation is a legal obligation associated with the disposal or retirement from service of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7569-110849 + Details
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