Costs and estimated earnings on uncompleted contracts Costs and estimated earnings on uncompleted contracts (Tables)

12 Months Ended

Jan. 31, 2013

Costs and estimated earnings on uncompleted contracts [Abstract]

Costs and estimated earnings on uncompleted contracts [Table Text Block]

	2012		2011
Costs incurred on uncompleted contracts	$71,382		$61,938
Estimated earnings	16,215		11,550
Earned revenue	87,597		73,488
Less billings to date	87,234		73,091
Costs in excess of billings, net	$363		$397
Balance sheet classification
Costs and estimated earnings in excess of billings on uncompleted contracts	$1,935		$2,375
Billings in excess of costs and estimated earnings on uncompleted contracts	(1,572	)	(1,978	)
Costs in excess of billings, net	$363		$397