Following are the components of selected balance sheet items:



	As of January 31
	2012			2011			2010
Accounts receivable, net:
Trade accounts	$	60,929		$	40,267		$	34,624
Allowance for doubtful accounts	(170		)	(300		)	(297		)
	$	60,759		$	39,967		$	34,327
Inventories:
Finished goods	$	7,094		$	7,994		$	6,283
In process	6,105			5,424			4,172
Materials	41,557			30,261			24,020
	$	54,756		$	43,679		$	34,475
Other current assets:
Insurance policy benefit	$	1,873		$	1,909		$	2,300
Prepaid expenses and other	1,030			1,330			490
	$	2,903		$	3,239		$	2,790
Property, plant and equipment, net:
Land	$	2,077		$	1,798		$	1,227
Buildings and improvements	36,952			24,972			22,973
Machinery and equipment	89,919			75,310			64,119
Accumulated depreciation	(67,054		)	(60,558		)	(55,290		)
	$	61,894		$	41,522		$	33,029
Other assets, net:
Investment in affiliate	$	4,409		$	4,728		$	5,010
Deferred income taxes	—			924			1,580
Other, net	155			43			59
	$	4,564		$	5,695		$	6,649
Accrued liabilities:
Salaries and benefits	$	4,297		$	3,264		$	1,148
Vacation	4,387			3,186			2,693
401(k) contributions	966			253			180
Insurance obligations	2,789			3,356			3,959
Profit sharing	1,244			1,627			217
Warranties	1,699			1,437			1,259
Taxes - accrued and withheld	2,596			1,453			1,574
Acquisition-related contingent consideration	3,266			263			103
Other	1,749			1,257			1,123
	$	22,993		$	16,096		$	12,256
Other liabilities:
Postretirement benefits	$	7,348		$	5,757		$	5,283
Acquisition-related contingent consideration	7,655			2,230			2,301
Deferred income taxes	4,518			—			—
Uncertain tax positions	4,946			4,224			3,514
	$	24,467		$	12,211		$	11,098