Following are the components of selected items from the Consolidated Balance Sheets:




	April 30, 2013			January 31, 2013			April 30, 2012
Accounts receivable, net:
Trade accounts	$	59,443		$	56,508		$	58,811
Allowance for doubtful accounts	(205		)	(205		)	(170		)
	$	59,238		$	56,303		$	58,641
Inventories:
Finished goods	$	8,533		$	8,571		$	7,688
In process	2,673			2,675			6,847
Materials	37,825			34,943			40,129
	$	49,031		$	46,189		$	54,664
Property, plant and equipment, net:
Property, plant and equipment	$	164,180		$	156,658		$	134,407
Accumulated depreciation	(78,081		)	(75,420		)	(69,519		)
	$	86,099		$	81,238		$	64,888
Accrued liabilities:
Salaries and benefits	$	2,726		$	3,978		$	2,635
Vacation	4,384			4,025			4,584
401(k) contributions	319			520			555
Insurance obligations	2,458			2,506			2,887
Profit sharing	88			287			413
Warranties	1,990			1,888			1,792
Acquisition-related contingent liabilities	845			712			6,658
Taxes - accrued and withheld	7,774			1,392			11,300
Other	1,148			1,884			1,141
	$	21,732		$	17,192		$	31,965
Other liabilities:
Postretirement benefits	$	8,120		$	8,072		$	7,423
Acquisition-related contingent consideration	2,076			2,359			2,169
Deferred income taxes	2,475			2,453			3,944
Uncertain tax positions	6,116			5,818			5,395
	$	18,787		$	18,702		$	18,931