Consolidated Balance Sheets (USD $) In Thousands	Apr. 30, 2011	Jan. 31, 2011	Apr. 30, 2010
Current Assets
Cash and cash equivalents	$ 42,125	$ 37,563	$ 46,972
Short-term investments	500	1,000	2,500
Accounts receivable, net of allowances of $302, $300, and $300, respectively	50,542	39,967	43,946
Inventories:
Materials	31,636	30,261	24,845
In process	5,986	5,424	6,397
Finished goods	7,916	7,994	6,304
Total inventories	45,538	43,679	37,546
Deferred income taxes	2,878	2,733	2,663
Prepaid expenses and other current assets	3,113	3,239	3,642
Total current assets	144,696	128,181	137,269
Property, plant and equipment	104,564	102,080	89,416
Accumulated depreciation	(62,155)	(60,558)	(56,369)
Property, plant and equipment, net	42,409	41,522	33,047
Goodwill	10,777	10,777	10,777
Amortizable intangible assets, net	1,700	1,585	2,039
Other assets, net	4,653	5,695	6,989
TOTAL ASSETS	204,235	187,760	190,121
Current Liabilities
Accounts payable	17,447	16,715	14,450
Accrued liabilities	11,782	14,643	11,693
Taxes — accrued and withheld	6,713	1,453	7,940
Customer advances	1,320	1,524	1,024
Total current liabilities	37,262	34,335	35,107
Other liabilities	12,637	12,211	11,378
Total liabilities	49,899	46,546	46,485
Commitments and contingencies
Shareholders’ equity:
Common stock, $1 par value, authorized shares 100,000; issued 32,528, 32,511 and 32,478, respectively	32,528	32,511	32,478
Paid in capital	7,540	7,060	5,808
Retained earnings	168,582	156,125	159,789
Accumulated other comprehensive income (loss)	(952)	(1,120)	(1,077)
Less treasury stock, at cost, 14,449 shares	(53,362)	(53,362)	(53,362)
Total shareholders’ equity	154,336	141,214	143,636
TOTAL LIABILITIES AND SHAREHOLDERS’ EQUITY	$ 204,235	$ 187,760	$ 190,121