CONSOLIDATED BALANCE SHEETS (USD $)	Dec. 31, 2012	Dec. 31, 2011
Current Assets:
Cash and cash equivalents	$ 7,999,000	$ 24,590,000
Short-term investments	8,182,000	20,279,000
Accounts receivable, net of allowance for doubtful accounts of $47 and $42 in 2012 and 2011, respectively	13,054,000	11,223,000
Inventories	23,779,000	24,582,000
Prepaid expenses and other current assets	3,110,000	2,313,000
Deferred income taxes	623,000	755,000
Total Current Assets	56,747,000	83,742,000
Long-term investments	28,433,000	10,336,000
Property, Plant and Equipment	124,180,000	114,975,000
Less accumulated depreciation and amortization	64,912,000	58,605,000
Property plant and equipment net	59,268,000	56,370,000
Other Assets and Deferred Charges:
Patents and licenses, net of accumulated amortization of $10,853 and $10,691 in 2012 and 2011, respectively	837,000	999,000
Goodwill	9,730,000	9,730,000
Other	795,000	718,000
Prepaid Expense and Other Assets, Noncurrent, Total	11,362,000	11,447,000
Total Assets	155,810,000	161,895,000
Current Liabilities:
Accounts payable	3,843,000	3,642,000
Accrued liabilities	2,900,000	5,566,000
Accrued income and other taxes	465,000	835,000
Total Current Liabilities	7,208,000	10,043,000
Line of credit
Other Liabilities and Deferred Credits:
Deferred income taxes	12,232,000	10,902,000
Other	1,542,000	2,436,000
Liabilities Noncurrent	13,774,000	13,338,000
Total Liabilities	20,982,000	23,381,000
Commitments and Contingencies
Stockholders' Equity:
Common stock, par value $.10 per share, authorized 10,000 shares, issued 3,420 shares	342,000	342,000
Additional paid-in capital	29,998,000	25,452,000
Retained earnings	152,630,000	153,618,000
Treasury shares, 1,399 shares in 2012 and 1,404 shares in 2011, at cost	(48,142,000)	(40,898,000)
Total Stockholders' Equity	134,828,000	138,514,000
Total Liabilities and Stockholders' Equity	$ 155,810,000	$ 161,895,000