CONSOLIDATED BALANCE SHEETS (USD $) In Thousands	Jun. 30, 2011	Dec. 31, 2010
Current assets:
Cash and cash equivalents	$ 9,744	$ 10,670
Short-term investments	19,166	10,715
Accounts receivable	14,835	11,521
Inventories	21,088	17,400
Prepaid expenses	2,780	1,050
Deferred income taxes	625	625
Assets, Current, Total	68,238	51,981
Long-term investments	18,742	20,291
Property, plant and equipment	108,810	103,789
Less accumulated depreciation and amortization	55,676	53,125
Property, Plant and Equipment, Net, Total	53,134	50,664
Other assets and deferred charges:
Patents	1,135	1,249
Goodwill	9,730	9,730
Other	779	737
Prepaid Expense and Other Assets, Noncurrent, Total	11,644	11,716
Assets, Total	151,758	134,652
Current liabilities:
Accounts payable and accrued liabilities	9,938	7,200
Accrued income and other taxes	807	552
Liabilities, Current, Total	10,745	7,752
Line of credit
Other non-current liabilities	11,736	10,283
Stockholders' equity:
Common shares, par value $0.10 per share; authorized 10,000 shares, issued 3,420 shares	342	342
Paid-in capital	24,805	24,331
Retained earnings	143,453	131,286
Treasury shares,1,396 at June 30, 2011 and 1,404 at December 31, 2010, at cost	(39,323)	(39,342)
Total stockholders' equity	129,277	116,617
Liabilities and Equity, Total	$ 151,758	$ 134,652