Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 23,747	$ 28,346
Short-term investments	15,049	44
Accounts receivable	20,124	16,620
Inventories	30,056	29,771
Prepaid expenses and other current assets	2,180	2,934
Deferred income taxes	580	580
Total Current Assets	91,736	78,295
Long-term investments	9,838	9,866
Property, plant and equipment	159,301	150,807
Less accumulated depreciation and amortization	93,618	87,493
Property plant and equipment net	65,683	63,314
Other assets and deferred charges:
Patents	2,005	2,193
Goodwill	9,730	9,730
Other	1,571	938
Prepaid Expense and Other Assets, Noncurrent, Total	13,306	12,861
Total assets	180,563	164,336
Current liabilities:
Accounts payable and accrued liabilities	9,252	8,987
Accrued income and other taxes	1,734	329
Total Current Liabilities	10,986	9,316
Line of credit	0	0
Other non-current liabilities	10,556	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	37,197	35,945
Accumulated other comprehensive income (loss)	(544)	283
Retained earnings	236,300	219,516
Treasury shares,1,596 at September 30, 2016 and 1,596 at December 31, 2015, at cost	(114,274)	(111,988)
Total stockholders' equity	159,021	144,098
Total liabilities and stockholders' equity	$ 180,563	$ 164,336

Sum of the carrying values as of the balance sheet date of obligations incurred through that date and due within one year (or the operating cycle, if longer), including liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received, taxes, interest, rent and utilities, accrued salaries and bonuses, payroll taxes and fringe benefits.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.