Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 29,863	$ 21,952
Certificates of deposit	10,800	6,098
Investments held to maturity at amortized cost	8,266	11,972
Accounts receivable, net	45,825	44,092
Income tax receivable	2,172	2,569
Notes receivable	24	30
Inventories, net	41,052	37,618
Prepaid expenses and other	763	609
Deferred tax assets	6,155	6,143
Total current assets	144,920	131,083
Property, plant and equipment:
Land	2,233	2,233
Buildings	67,580	64,938
Machinery and equipment	136,952	127,968
Furniture and fixtures	10,746	10,388
Total property, plant and equipment	217,511	205,527
Less: Accumulated depreciation	121,215	113,605
Property, plant and equipment, net	96,296	91,922
Certificates of deposit	2,120	5,280
Investments held to maturity at amortized cost	11,072	4,015
Note receivable	690	817
Total assets	255,098	233,117
Current liabilities:
Revolving credit facility	0	0
Accounts payable	7,759	11,370
Accrued liabilities	34,482	31,343
Total current liabilities	42,241	42,713
Deferred revenue	689	1,006
Deferred tax liabilities	12,689	13,677
Donations	$ 1,108	$ 1,662
Commitments and contingencies
Stockholders' equity:
Preferred stock, $.001 par value, 5,000,000 shares authorized, no shares issued	$ 0	$ 0
Common stock, $.004 par value, 100,000,000 shares authorized, 54,139,246 and 54,041,829 issued and outstanding at September 30, 2015 and December 31, 2014, respectively	217	216
Additional paid-in capital	0	0
Retained earnings	198,154	173,843
Total stockholders' equity	198,371	174,059
Total liabilities and stockholders' equity	$ 255,098	$ 233,117