Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
CURRENT ASSETS:
Cash and cash equivalents	$ 56,222	$ 54,043
Marketable securities	32,259	22,404
Accounts receivable	69,424	70,171
Less allowance for doubtful accounts	1,896	1,419
Accounts receivable, net	67,528	68,752
Inventories:
Finished goods	32,585	30,308
Work in process	57,484	50,569
Raw materials and supplies	8,553	8,181
Total inventory	98,622	89,058
Income tax receivable		1,668
Other current assets	6,961	9,671
Total current assets	261,592	245,596
PROPERTY, PLANT AND EQUIPMENT:
Land and land improvements	4,807	4,757
Buildings	43,392	39,927
Machinery and equipment	129,429	126,580
PROPERTY, PLANT AND EQUIPMENT	177,628	171,264
Less allowance for depreciation	86,322	75,721
PROPERTY, PLANT AND EQUIPMENT, NET	91,306	95,543
GOODWILL	11,485	11,485
INTANGIBLE ASSETS, net	5,471	10,644
NOTE RECEIVABLE	3,940	3,818
DEFERRED INCOME TAXES	3,336	2,335
OTHER ASSETS	10,254	4,650
Total assets	387,384	374,071
CURRENT LIABILITIES:
Accounts payable	32,536	32,948
Federal and state income taxes	2,196
Accrued liabilities	13,398	15,680
Total current liabilities	$ 48,130	$ 48,628
COMMITMENTS AND CONTINGENCIES
STOCKHOLDERS' EQUITY
Common stock, $1 par value: Authorized: 12,000,000 shares at December 31, 2015 and 2014; Issued: 7,440,518 shares at December 31, 2015 and 2014; Outstanding: 6,935,471 and 6,917,222 shares at December 31, 2015 and 2014, respectively	$ 7,441	$ 7,441
Paid-in capital	6,775	5,906
Retained earnings	340,799	328,417
Accumulated other comprehensive loss	(9)	(3)
Stockholders' Equity before Treasury Stock	355,006	341,761
Less treasury stock, at cost, 505,047 and 523,296 shares at December 31, 2015 and 2014, respectively	15,752	16,318
Total stockholders' equity	339,254	325,443
Total liabilities and stockholders' equity	$ 387,384	$ 374,071