Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 27,947	$ 28,346
Short-term investments	39	44
Accounts receivable	21,717	16,620
Inventories	30,468	29,771
Prepaid expenses and other current assets	1,372	2,934
Deferred income taxes	580	580
Total Current Assets	82,123	78,295
Long-term investments	11,092	9,866
Property, plant and equipment	153,660	150,807
Less accumulated depreciation and amortization	89,548	87,493
Property plant and equipment net	64,112	63,314
Other assets and deferred charges:
Patents	2,131	2,193
Goodwill	9,730	9,730
Other	999	938
Prepaid Expense and Other Assets, Noncurrent, Total	12,860	12,861
Total assets	170,187	164,336
Current liabilities:
Accounts payable and accrued liabilities	8,500	8,987
Accrued income and other taxes	2,538	329
Total Current Liabilities	11,038	9,316
Line of credit	0	0
Other non-current liabilities	10,597	10,922
Stockholders' equity:
Common stock, par value $0.10 per share; authorized 10,000 shares, issued 3,420 shares	342	342
Paid-in capital	36,447	35,945
Accumulated other comprehensive income	215	283
Retained earnings	224,810	219,516
Treasury shares, 1,600 at March 31, 2016 and 1,596 at December 31, 2015, at cost	(113,262)	(111,988)
Total stockholders' equity	148,552	144,098
Total liabilities and stockholders' equity	$ 170,187	$ 164,336