Following are the components of selected balance sheet items:



	As of January 31,
	2013			2012			2011
Accounts receivable, net:
Trade accounts	$	56,508		$	60,929		$	40,267
Allowance for doubtful accounts	(205		)	(170		)	(300		)
	$	56,303		$	60,759		$	39,967
Inventories:
Finished goods	$	8,571		$	7,094		$	7,994
In process	2,675			6,105			5,424
Materials	34,943			41,557			30,261
	$	46,189		$	54,756		$	43,679
Other current assets:
Insurance policy benefit	$	860		$	1,873		$	1,909
Prepaid expenses and other	936			1,030			1,330
	$	1,796		$	2,903		$	3,239
Property, plant and equipment, net:
Land	$	2,077		$	2,077		$	1,798
Buildings and improvements	52,936			36,952			24,972
Machinery and equipment	101,645			89,919			75,310
Accumulated depreciation	(75,420		)	(67,054		)	(60,558		)
	$	81,238		$	61,894		$	41,522
Other assets, net:
Investment in affiliate	$	4,063		$	4,409		$	4,728
Deferred income taxes	—			—			924
Other, net	206			155			43
	$	4,269		$	4,564		$	5,695
Accrued liabilities:
Salaries and benefits	$	3,978		$	4,297		$	3,264
Vacation	4,025			4,387			3,186
401(k) contributions	520			966			253
Insurance obligations	2,506			2,789			3,356
Profit sharing	287			1,244			1,627
Warranties	1,888			1,699			1,437
Taxes - accrued and withheld	1,392			2,596			1,453
Acquisition-related contingent consideration	712			3,266			263
Other	1,884			1,749			1,257
	$	17,192		$	22,993		$	16,096
Other liabilities:
Postretirement benefits	$	8,072		$	7,348		$	5,757
Acquisition-related contingent consideration	2,359			7,655			2,230
Deferred income taxes	2,453			4,518			—
Uncertain tax positions	5,818			4,946			4,224
	$	18,702		$	24,467		$	12,211