Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 12,085		$ 3,159
Certificates of deposit	8,110		3,120
Investments held to maturity at amortized cost	16,040		2,832
Accounts receivable, net	39,063		43,866
Income tax receivable	1,073		694
Notes receivable	29		28
Inventories, net	32,140		32,614
Prepaid expenses and other	304		740
Deferred tax assets	4,779		4,493
Total current assets	113,623		91,546
Property, plant and equipment:
Land	1,417		1,340
Buildings	61,821		59,761
Machinery and equipment	119,439		117,617
Furniture and fixtures	9,748		8,906
Total property, plant and equipment	192,425		187,624
Less: Accumulated depreciation	105,142		96,929
Property, plant and equipment, net	87,283		90,695
Certificates of deposit	2,638		2,120
Investments held to maturity at amortized cost	10,981		8,041
Notes receivable, long-term	919		1,091
Total assets	215,444		193,493
Current liabilities:
Revolving credit facility	0		0
Accounts payable	7,779		13,047
Accrued liabilities	28,550		26,578
Total current liabilities	36,329		39,625
Deferred revenue	585		0
Deferred tax liabilities	14,424		15,732
Commitments and contingencies
Stockholders' equity:
Preferred stock, $.001 par value, 5,000,000 shares authorized, no shares issued
Common stock, $.004 par value, 50,000,000 shares authorized, 36,711,354 and 36,776,624 issued and outstanding at December 31, 2013 and 2012, respectively	147	[1]	147	[1]
Additional paid-in capital
Retained earnings	163,959		137,989
Total stockholders' equity	164,106		138,136
Total liabilities and stockholders' equity	$ 215,444		$ 193,493

[1] Reflects three-for-two stock split effective July 2, 2013