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Discontinued operations (Details Narrative) (USD $) In Thousands, unless otherwise specified	1 Months Ended	36 Months Ended	60 Months Ended	1 Months Ended	12 Months Ended
	Aug. 31, 2009 Sunbelt Transport	Jul. 31, 2012 Sunbelt Transport	Aug. 31, 2014 Sunbelt Transport	Dec. 31, 2010 Caroline County	Sep. 30, 2011 Caroline County	Dec. 17, 2010 Caroline County
SunBelt Jacksonville monthly terminal rental		$ 5,000
SunBelt South Pittsburg monthly terminal rental			5,000
Additional payment received on option to sell South Pittsburg terminal			100,000
Cash payment on delivery of promissory note for sale of SunBelt	1,000,000
Promissory note monthly proceeds on sale of SunBelt Transport			130,000
Interest rate on promissory note for sale of SunBelt Transport			7.00%
Acres sold in Caroline County bargain sale						1,777
Caroline County bargain sale purchase price				5,200,000
Donated value of minerals and aggregates in Caroline County bargain sale					5,599,000
Permanent tax benefit on Caroline County bargain sale					2,126,000
Income tax receivable on Caroline County bargain sale					303,000
Long-term deferred tax liability on Caroline County bargain sale						1,823,000
Tax carry forward period					5
Book value of property sold in Caroline County bargain sale						$ 276,000